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CCNA - CommandGuide
| Question | Answer |
|---|---|
| Class A address leading bit pattern/1st octet/notes | 0xxxxxxx/0-127/ 0 is invalid |
| Class B address leading bit pattern/1st octet/notes | 10xxxxxx/128-191/ |
| Class C address leading bit pattern/1st octet/notes | 110xxxxx/192-223/ |
| Class D address leading bit pattern/1st octet/notes | 1110xxxx/224-239/Reserved for multicasting |
| Class E address leading bit pattern/1st octet/notes | 1111xxxx/240-255/Reserved for future use or testing. |
| Use subnets with all zeroes or ones. | Router(config)# ip subnet-zero |
| Requirements for route summarization. | 1) Routers need to be running a classless routing protocol |
| If Ethernet LAN port or connection what's the port type | what's it connected to |
| If T1/E1 WAN port or connection what's the port type | what's it connected to |
| If Console what's the port type | what's it connected to |
| If Aux what's the port type | what's it connected to |
| If BRI S/T what's the port type | what's it connected to |
| If BRI U WAN what's the port type | what's it connected to |
| To cable computer COM port to console of router/switch | Use rollover cable |
| To cable computer NIC to switch/hub | Use straight-through cable |
| To cable computer NIC to computer NIC | Use crossover cable |
| To cable switch or hub port to router's Ethernet port | Use straight-through cable. |
| To cable switch or hub port to switch or hub port | Use crossover cable (check for uplink button or toggle switch to defeat this) |
| To cable router's Ethernet port to router's Ethernet port | Use crossover cable |
| To cable computer NIC to router's Ethernet port | Use crossover cable |
| To cable router's serial port to router's serial port | Use Cisco serial DCE/DTE cables |
| List all commands available in the current command mode | Router#? |
| List all the possible command choices that start with c | Router#c? |
| What tells you that there are more parameters that need to be entered | % Incomplete Command |
| Show all subcommands for a command. | Router#command ? |
| No error message or 'Incomplete Command' message means the command was entered - | successfully Router# |
| Move user from user mode to privileged mode in router or switch | Router>enable Router# or switch>enable switch# |
| Log a user off from privileged (router) or user mode (router and switch) | Router#exit or Router>exit or switch>exit |
| To move back one level | Router(config-if)#exit Router (config)# or Router(config)#exit Router# |
| To move from privileged mode back to user mode in router or switch | Router#disable Router> or switch#disable |
| Alternative to 'exit' command | Router#logout |
| To enter startup mode from the command line if no startup config present. | Router#setup |
| Move cursor to beginning of line | Ctrl A |
| Move cursor back one word | Esc b |
| Move cursor back one character | Ctrl b (or <- ) |
| Move cursor to end of line | Ctrl e |
| Move cursor forward one character | Ctrl f (or -> ) |
| Move cursor forward one word | Esc f |
| Move from any prompt back down to privileged mode | Ctrl z |
| What indicates that the line has been scrolled to the left | $ |
| Turn off the ability to use keyboard shortcuts | Router#terminal no editing |
| Re-enable enhanced editing mode to use keyboard shortcuts | Router#terminal editing |
| Recall commands in the history buffer in a backward sequence | beginning with the most recent command |
| Return to more recent commands in the history buffer after recalling commands with ctrl p key sequence | Ctrl n (or down arrow) |
| Set the number of commands in the buffer that can recalled by the router (maximum number is 256) | Router#terminal history size number or Router#history size number |
| Display information about currently loaded IOS including configuration register (router) or software and hardware (switch) | Router# show version or switch# show version |
| Display information about flash memory | Router#show flash |
| List all commands used at this edit level in the history buffer. | Router#show history |
| Indication of user mode | Router> Limited viewing of config cannot make changes in this mode. |
| Indicator of privileged mode | Router# Can see config and move to make changes |
| Indicator of global configuration mode | Router(config)# |
| Indicator of interface mode | Router(config-if)# |
| Indicator of subinterface mode | Router(config-subif)# |
| Indicator of line mode | Router(config-line)# |
| Indicator of router configuration mode | Router(config-router)# |
| Move to global config mode. | Router#config terminal |
| Configure a router or switch name. Includes 1900 series switches. | Router(config)# hostname shem or (config)#hostname shem |
| Set enable password on router or switch (2900/2950). | Router(config)# enable password shem or 2900Switch(config)# enable password shem |
| Set enable secret password on router or switch | Router(config)# enable secret shem |
| Enter console-line mode on router or switch (2900/2950) | Router(config)#line con 0 or 2900Switch(config)# line con 0 |
| Set console-line mode password to shem on switch or router (2900/2950) | Router(config-line)# password shem or 2900Switch(config-line)# password shem |
| Enable password checking at login for router or switch (2900/2950) | Router(config-line)# login or 2900Switch(config-line)# login |
| Enter vty line mode for all five vty lines on router or switch | Router(config)# line vty 0 4 |
| Set vty password to shem | Router(config-line)# password shem |
| Enter auxiliary line mode | Router(config)# line aux 0 |
| Apply a weak encryption to passwords (from time of entry onwards) | Router(config)# service password-encryption |
| Display statistics for all interfaces (router) or interface configuration and status of line: up/up | up/down |
| Display statistics for a specific interface | Router# show interface type number |
| Display a summary of all interfaces | including status and IP address assigned |
| Display statistics for interface hardware. Statistics display the clock rate if set and if the cable is DCE | DTE |
| Display time set on device | Router# show clock |
| Display local host-to-IP address cache. These are the names and addresses of hosts on the network to which you can connect | Router# show hosts |
| Display all users connected to device | Router# show users |
| Display the ARP table | Router# show arp |
| Display status of configured Layer 3 protocols | Router# show protocols |
| Display configuration saved in NVRAM. | Router# show startup-config or switch# show start |
| Display configuration currently in RAM (router) or DRAM (switch) | Router# show running-config [pre 12.0] more system:running-config [12.x] or switch# show running-config |
| Move to interface Serial x/y mode | Router(config)# int sx/y |
| Define optional locally significant descriptor of the link (routers and switches). | Router(config-if) #description Blah blah |
| Assign address and subnet mask to serial interface | Router(config-if)# ip address a.a.a.a m.m.m.m |
| Assign a clock rate for the serial interface (DCE only) | Router(config-if)# clock rate rrrrr |
| Turn interface on | Router(config-if)# no shut |
| Move to FAst ethernet x/y interface mode | Router(config)# int fax/y |
| Create a MOTD banner. | Router(config)# banner motd # Blah blah# Where the non-initial # is a delimiter |
| Set the time zone for display purposes based on CUT. | Router(config)# clock timezone thezone disp |
| Assign a locally significant host name to an IP address. | Router(config)# ip host shem a.a.a.a |
| Turn off trying to automatically resolve an unrecognized command to a local host name if one is not going to set up DNS. | Router(config)# no ip domain-lookup |
| Turn on synchronous logging. Information items sent to console will not interrupt the command one types. The command will be moved to a new line | Router(config-line)# logging synchronous (The informational line does not get inserted into the middle of the command one was trying to type. If one were to continue typing |
| Set time limit when console automatically logs off. | Router(config-line)# exec-timeout m s (Don't use 0 0 in production as it means no timeout.) |
| Save the running-config from DRAM to local NVRAM Router will execute commands in order they were entered on next reload | Router# copy run start [pre 12.0] copy system:running-config nvram:startup-config [12.x] (Doesn't exist for 1900 series switch) |
| Save the running-config remotely to TFTP server | Router# copy run tftp [pre 12.0] copy system:running-config tftp: [12.x] Will have to reply IP address of TFTP server & dest file name. |
| Delete the startup-config file from NVRAM without affecting dynamic memory. | Router# erase start [pre 12.0] erase nvram: [12.x] (Reload the router to clear the running-config.) |
| Default routing in static case using next-hop address | Router(config)# ip route 0.0.0.0 0.0.0.0 a.a.a.a |
| Default routing in static case specifying exit interface | Router(config)#ip route 0.0.0.0 0.0.0.0 typeport |
| Display contents of IP routing table | Router# show ip route (The codes to the left of the routes in the table tell you from where the router learned the routes. A static route is described by the letter S.) |
| Instruct IOS to forward packets destined for an unknown subnet to the best supernet route. A supernet route covers a range of subnets with a single entry. Cmd used in RIP. | Router(config)# ip classless |
| Enable RIP (v1 or v2) as a routing protocol from this mode. | Router(config)# router rip |
| Specify the network number of the directly connected network you want to advertise. In RIP-1 | RIP-2 |
| RIP updates will not be sent out an interface | Router(config-router)# passive-interface typeport |
| Define a specific neighbor with which to exchange information | Router(config-router)# neighbor a.b.c.d |
| Turn off split horizon (on by default) | Router(config-router)# no ip split-horizon |
| Change timers in RIP in seconds except where specified. | Router(config-router# timers basic upd inv holddwn flush sleep(ms) |
| Limit the number of paths for load balancing to x | Router(config-router)# maximum-paths x (4 = default |
| Generate a default route into RIP. | Router(config-router)# default-information originate |
| RIP will now send and receive RIP-2 packets globally as v1 is default | Router(config-router)# version 2 |
| Make interface send only RIP-1 packets | Router(config-if)# ip rip send version 1 |
| Make interface send only RIP-2 packets | Router(config-if)# ip rip send version 2 |
| Make interface send both RIP-1 and RIP-2 packets | Router(config-if)# ip rip send version 1 2 |
| Make interface receive only RIP-1 packets | Router(config-if)# ip rip receive version 1 |
| Make interface receive only RIP-2 packets | Router(config-if)# ip rip receive version 2 |
| Make interface receive both RIP-1 and RIP-2 packets | Router(config-if)# ip rip receive version 1 2 |
| Display all RIP activity in real time | Router# debug ip rip |
| Display contents of the RIP database | Router# show ip rip database |
| Change back to RIP-1 | Router(config-router)# no version 2 |
| Change RIP routing to RIP-1 from router-config mode. | Router(config-router)# version 1 |
| Turn off RIP-2's summarization of networks at the classful boundary. | Router(config-router)# no auto-summary |
| Re-enable RIP-2's summarization of networks at the classful boundary. | Router(config-router)# auto-summary |
| Enable IGRP routing process. No longer supported by Cisco as of Cisco IOS Software Release 12.3. If one uses Cisco IOS 12.3 or newer code | one must use either Enhanced IGRP (EIGRP) or one of the other standards-RIP-1 |
| Disable the IGRP routing process | Router(config)# no router igrp as-number |
| Remove network w.x.y.z from the IGRP routing process. | Router(config-router)# no network w.x.y.z |
| Set the bandwidth of this interface to x kilobits to allow IGRP to make a better routing decision | Router(config-if)# bandwidth x |
| Allow IGRP to accept unequal-cost routes | Router(config-router)# variance x |
| Show all IGRP events in real time. | Router# debug ip igrp events |
| Show IGRP updates between routers | Router# debug ip igrp transactions |
| Turn on the EIGRP process All routers in the same AS must use the same AS number | Router(config)# router eigrp as-number (1 - 65535) |
| Specify which network to advertise in EIGRP | Router(config-router)# network w.x.y.z |
| Log any changes to an EIGRP neighbor adjacency. Recommended for debugging. | Router(config-router)# eigrp log-neighbor-changes |
| Turn off the auto-summarization feature in EIGRP. Networks are summarized at the classful boundary by default in EIGRP. | Router(config-router)# no auto-summary |
| Enable manual summarization on this specific EIGRP interface for the given address and mask. Recommended practice is that one turns off automatic summarization | use the ip summary-address command |
| Display an EIGRP neighbor table | Router# show ip eigrp neighbors |
| Display a detailed EIGRP neighbor table | Router# show ip eigrp neighbors detail |
| Display EIGRP information for each interface | Router# show ip eigrp interfaces |
| Display EIGRP information for a specific interface | Router# show ip eigrp int type port |
| Display EIGRP information for interfaces running a specific process | Router# show ip eigrp int processnumb |
| Display the EIGRP topology table which will display where feasible successors are. | Router# show ip eigrp topology |
| Display the number and type of packets sent and received in EIGRP. | Router# show ip eigrp traffic |
| Display events/actions related to the DUAL FSM in EIGRP. | Router# debug eigrp fsm |
| Display events/actions related to EIGRP packets | Router# debug eigrp packet |
| Display events/actions related to EIGRP neighbors | Router# debug eigrp neighbor |
| Advertise OSPF interface using the wildcard mask to determine which interfaces to advertise as being in which area. | Router(config-router)# network w.x.y.z m.m.m.m area n |
| Turn on specified OSPF process number. The process ID is any value between 1-65535. The process ID is not related to the OSPF area. Unlike IGRP or EIGRP | matching this number across all routers does not ensure network adjacencies will form. |
| A 0 (zero) in a wildcard mask means | Check the corresponding bit in the address for an exact match. |
| A 1 (one) in a wildcard mask means | Ignore the corresponding bit in the address. It can be either 1 or 0. |
| Any OSPF interface with an exact address of 172.16.10.1 is to be put into area 0. | Router(config-router)# network 172.16.10.1 0.0.0.0 area 0 |
| Any OSPF interface with an address of 172.16.x.x is to be put into area 0. | Router(config-router)# network 172.16.10.0 0.0.255.255 area 0 |
| Any OSPF interface with any address is to be put into Area 0 | Router(config-router)# network 0.0.0.0 255.255.255.255 area 0 |
| Move to virtual interface Loopback 0. Loopback interfaces are always "up and up" and do not go down unless manually shut down. This makes Loopback interfaces great for using as an OSPF router ID. | Router(config)# interface lo0 |
| Change OSPF interface priority to nn. A priority of 0 guarantees that the router never wins a designated router (DR) election | and 255 guarantees a tie in the election (tie broken by highest router ID). |
| Change the bandwidth in OSPF to recalculate the cost of the link. | Router(config-if)# bandwidth nnn |
| Change the OSPF cost metric to a value of nnnn. Cost = refbw/intbw | Router(config-if)# ip ospf cost nnnn |
| Turns on simple OSPF authentication. Password sent in clear text. | Router(config-router)# area nn authentication |
| Set OSPF key (password) to whatever | Router(config-if)# ip ospf authentication-key whatever |
| Enables OSPF authentication for specified area with MD5 password encryption | Router(config-router)# area nn authentication message-digest |
| Enable OSPF MD5 algorithm authentication for a particular key-id and key (password) which must be same as neighboring router. | Router(config-if)# ip ospf message-digest-key key-id md5 key |
| Change OSPF 'Hello' interval timer to n seconds. Must match for router to be neighbor. | Router(config-if)# ip ospf hello-interval timer n |
| Change OSPF 'dead' interval timer to nn seconds. Must match for routers to be neighbors. | Router(config-if)# ip ospf dead-interval nn |
| Create a default route in OSPF. | Router(config)# ip route 0.0.0.0 0.0.0.0 int |
| Set the default route to be propagated to all OSPF routers | Router(config-router)# default-information-originate |
| Display basic OSPF information | Router# show ip ospf |
| Display OSPF information as it relates to all interfaces | Router# show ip ospf interface |
| Display OSPF information for specified interface. | Router#show ip ospf inttype intno |
| List all OSPF neighbors and their states | Router# show ip ospf neighbor |
| Display a detailed list of OSPF neighbors | Router# show ip ospf neighbor detail |
| Display contents of OSPF database | Router# show ip ospf database |
| Clear entire routing table | forcing it to rebuild |
| Clear specific route to network a.b.c.d | Router# clear ip route a.b.c.d |
| Reset OSPF counters | Router# clear ip ospf counters |
| Reset entire OSPF process forcing OSPF to re-create neighbors | database |
| Display all OSPF events | Router# debug ip ospf events |
| Display various OSPF states and DR and BDR election between adjacent routers | Router# debug ip ospf adj |
| Display OPSF packets | Router# debug ip ospf packets |
| Display information on flash memory (for the 2900/2950 series only) | switch# show flash: |
| Display current switch MAC address forwarding table | switch# show mac-address-table |
| Display information about switch Ethernet controller | switch# show controllers ethernet-controller |
| Display whether the switch passed POST | switch# show post |
| Display the current VLAN configuration | switch# show vlan |
| Display setting of virtual interface VLAN 1 | the default VLAN on the switch |
| Remove VLAN Trunking Protocol (VTP) information from 1900 series switch. | 1900switch# delete vtp |
| Reset 1900 series switch back to factory defaults | 1900switch# delete nvram |
| Restart a 1900 series switch | 1900switch# reload |
| Set the 1900 series user mode password to shem. | 1900Switch(config)# enable password level 1 shem |
| Set the 1900 series enable mode password to shem | 1900Switch(config)# enable password level 15 shem |
| Set the 1900/2900/2950 series enable secret password to shem. | 1900Switch(config)# enable secret shem or 2900Switch(config)# enable secret shem |
| Set 1900 series switch IP address and mask to allow for remote access | 1900Switch(config)# ip address w.x.y.z m.m.m.m |
| Set the 1900 series switch default gateway address to allow IP information an exit past the local network | 1900Switch(config)# ip default-gateway w.x.y.x |
| Force full-duplex operation on 1900/2900/2950 switches | Switch(config-if)# duplex full |
| Enable auto-duplex config on 1900/2900/2950 switches | Switch(config-if)# duplex auto |
| Force half-duplex operation on 1900/2900/2950 | Switch(config-if)# duplex half |
| Force 10-Mbps operation on 2900/2950 switch | 2900Switch(config-if)# speed 10 |
| Force 100-Mbps operation on 2900/2950 switches | 2900Switch(config-if)# speed 100 |
| Enable auto-speed configuration on 2900/2950 switches | 2900Switch(config-if)# speed auto |
| Turn on HTTP service with 1900/2900/2950 | X900Switch(config)# ip http server |
| Set port number for HTTP on 1900/2900/2950 switches. This port should be turned off for security reasons unless it is being used | X900Switch(config)# ip http port 80 |
| Display current MAC address forwarding table on 1900/2900/2950 switches | switch# show mac-address-table |
| Delete all entries from current MAC address forwarding table 1900/2900/2950 switches | switch# clear mac-address-table |
| Delete only dynamic entries from MAC address table of 1900/2900/2950 switches | switch# clear mac-address-table dynamic |
| Set a permanent address of aaaa.aaaa.aaaa in the MAC address table for an interface in a 1900 switch | 1900Switch(config)# mac-address-table permanent aaaa.aaaa.aaaa typeportnumb |
| Delete all permanent entries in a 1900 switch MAC address table. | 1900Switch# clear mac-address-table perm |
| Make a 1900 switch interface secure | 1900Switch(config-if)# port secure |
| Allow only nn MAC addresses in the MAC table for this interface on a 1900 switch | 1900Switch(config-if)# port secure max-mac-count nn |
| Display the MAC address table with security information of a 1900 switch | 1900Switch# show mac-address-table security |
| Display the spanning-tree table of the switch (Cisco IOS 12.1 and later) | Switch# show spanning-tree |
| Display spanning-tree info for port type portno | 2950# show spanning-tree int type portno |
| Display spanning tree info for a specific VLAN | 2950# show spanning-tree vlan x |
| Display all informational messages about changes in the spanning tree topology | 2950# debug spanning-tree {all} |
| Change Spanning-Tree Priority of a Switch. In Cisco IOS 12.1 where nn can be from 1-65535. Lower number means better chance of being elected the root bridge. The default is 32768. | Switch(config)#spanning-tree vlan 1 priority nn |
| Change this switch to the root switch for VLAN x by lowering its priority to either 24576 or 100 less than current root bridge | whichever number is lower |
| Configure EtherChannel where x is the number of the channel-group and must match the other interface | Switch(config-if)# channel-group x mode on |
| Display detailed EtherChannel information | Switch# show etherchannel x detail |
| Display EtherChannel port information | Switch# show etherchannel x port |
| Display EtherChannel port-channel information | Switch# show etherchannel x port-channel |
| Display a one-line summary per channel-group in EtherChannel environment | Switch# show etherchannel x summary |
| Display 1900 series VLAN information | 1900Switch# show vlan |
| Display which ports belong to which VLAN on a 1900 switch | 1900Switch# show vlan-membership |
| Display information about VLAN n only on a 1900 switch | 1900Switch# show vlan 2 |
| Create and name static VLAN nn on 1900 switch | 1900Switch(config)# vlan n name shem |
| Assign 1900 switch port to VLAN n | 1900Switch(config-if)# vlan static n |
| Assigning 2950 Switch Ports Using the range Command | 2950Switch(config)# int range type crd/port/m - n Note space surrounding hyphen |
| Set all 2950 ports to access mode | 2950Switch(config-if-range)# switchport mode access |
| Assign all 2950 ports to VLAN nn | 2950Switch(config-if-range)# switchport access vlan 10 |
| Delete all VLAN information from the 1900 series switch and reset VTP parameters to the factory defaults | 1900Switch# delete vtp |
| Remove interface from 1900 series VLAN nn and puts it back into default VLAN 1 | 1900Switch(config-if)# no vlan static nn |
| Remove only VLAN nn from 1900 series switch database | 1900Switch(config)# no vlan nn name shem |
| Display the complete VLAN database | 2900Switch# show vlan |
| Display a summary of the VLAN database | 2900Switch# show vlan brief |
| Display a summary of each switch interface | including speed and duplex settings |
| Display information about VLAN packets a switch has received but is not capable of supporting | 2900Switch# debug sw-vlan packets |
| Turn trunking mode on in 1900 switch | 1900Switch(config-if)# trunk on |
| Turn port to trunking mode on 2900 series switch | 2900Switch(config-if)# switchport mode trunk |
| Set encapsulation type to Dot1Q on 2900 series switch. This is the default encapsulation type | 2900Switch(config-if)# switchport trunk encapsulation dot1q |
| Display trunking information about port 0/26 on 1900 series switch | 1900Switch# show trunk A |
| Change the 1900 series switch to VTP client mode | 1900Switch(config)# vtp client |
| Changes the 1900 series switch to default VTP server mode | 1900Switch(config)# vtp server |
| Change the 1900 series switch to VTP transparent mode | 1900Switch(config)# vtp transparent |
| Set the name of the 1900 series switch VTP management domain to shem | 1900Switch(config)# vtp domain shem |
| Set the VTP password to shem | 1900Switch(config)# vtp password shem |
| Display all 1900 series VTP information | 1900Switch# show vtp |
| Load IOS with image-name. If entered first it is the first place the router will go to look for the IOS. | Router(config)# boot system flash image-name |
| Load IOS with image-name from a TFTP server. Enter first if you want to go to a TFTP server first. | Router(config)# boot system tftp image-name w.x.y.z |
| Load IOS from ROM | Router(config)# boot system rom |
| Copies configuration file from TFTP server to DRAM | Router# copy tftp run [pre 12.0] Router# copy tftp: system:running-config [12.x] Will have to supply IP address of TFTP server and file name to be retrieved. |
| Backing Up IOS to TFTP Server | Router# copy flash tftp 2900Switch# copy flash:filename tftp Will have to supply name of IOS image and address of TFTP server and dest file name. |
| Restoring/Upgrading IOS from TFTP Server | Router# copy tftp flash Will have to supply addr or name of remote host |
| Firmware Upgrade of Catalyst 2950 Series Switch | 2950Switch#archive tar /x tftp://w.x.y.x/filename.tar flash: |
| Make switch now boot to this IOS | 2950Switch(config)# boot system flash filename.bin |
| Changes the router configuration register to nnnn | router(config)# config-register 0xnnnn |
| Password Recovery Procedures for Cisco Routers | 1: Boot the router and interrupt the boot sequence as soon as text appears on the screen. 2: Change the configuration register to ignore contents of NVRAM (0x2142). 3: Reload the router. 4: Enter privileged mode. (Do not enter setup mode.) 5: Copy startup |
| Password Recovery for 2900/2950 Series Switches | 1. Unplug the power supply from the back of the switch 2. Press and hold the Mode button on the front of the switch 3. Plug the switch back in 4. a) For the 2900 series switch Wait until the LED above port 1X goes out |
| Display global CDP information (such as timers) | Router# show cdp |
| Display information about neighbors | Router# show cdp neighbors |
| Display more detail about neighbor device | Router# show cdp neighbors detail |
| Display information about device named shem | Router# show cdp entry shem |
| Display information about all devices | Router# show cdp entry * |
| Display info about interfaces that have CDP running | Router# show cdp interface |
| Display info about specific interface x running CDP | Router# show cdp interface x |
| Display traffic info-packets in/out/version | Router# show cdp traffic |
| Change length of time to keep CDP packets | Router(config)# cdp holdtime x |
| Change how often CDP updates are sent | Router(config)# cdp timer x |
| Enable CDP globally (on by default) | Router(config)# cdp run |
| Turn off CDP globally | Router(config)# no cdp run |
| Enable CDP on a specific interface | Router(config-if)# cdp enable |
| Turn off CDP on a specific interface | Router(config-if)# no cdp enable |
| Reset traffic counters to 0 | Router# clear cdp counters |
| Delete the CDP table | Router# clear cdp table |
| Monitor CDP neighbor information | Router# debug cdp adjacency |
| Monitor all CDP events | Router# debug cdp events |
| Monitor CDP events specifically for IP | Router# debug cdp ip |
| Monitor CDP packet-related information | Router# debug cdp packets |
| Telnet to router shem if ip host command was used previously to create a mapping of an IP address to the word shem | Router>telnet shem |
| Telnet to a dotted decimal address. | Router>telnet 172.16.20.1 |
| Connect remotely to 'shem' using command other than 'telnet' command | Router> connect shem |
| Connect remotely to dotted decimal address without using a command. | Router> w.x.y.z |
| Disable ICMP redirects from this specific interface | Router(config-if)# no ip redirects |
| Re-enable ICMP redirects from this specific interface | Router(config-if)# ip redirects |
| Check for Layer 3 connectivity with device at address w.x.y.z | Router# ping w.x.y.z |
| Enter extended ping mode | which provides more options |
| Discover route taken to travel to destination | Router# traceroute w.x.y.z |
| Short form of traceroute command with IP host name | Router# trace paris |
| Set a read-only (ro) community string called shem | Router(config)# snmp-server community shem ro |
| Set a read-write (rw) community string called shem | Router(config)# snmp-server community shem rw |
| Define an SNMP string that describes the physical location of the SNMP server as 'text'. | Router(config)# snmp-server location text |
| Define an SNMP string that describes the sysContact information as 'text'. | Router(config)# snmp-server contact text |
| Enable logging to all supported destinations | Router(config)# logging on |
| Send logging messages to a syslog server host at address w.x.y.z | Router(config)# logging w.x.y.x |
| Send logging messages to a syslog server host named shem. | Router(config)# logging shem |
| Set the syslog server logging level to value x | where x is a number between 0 and 7 or a word defining the level. The table that follows provides more details |
| Give Syslog messages a timestamp | Router(config)# service timestamps log datetime |
| Display routing table about a specific protocol (for example | RIP or IGRP) |
| Display info about route w.x.y.z | Router# show ip route w.x.y.z |
| Display table of connected routes | Router# show ip route connected |
| Display table of static routes | Router# show ip route static |
| Display summary of all routes | Router# show ip route summary |
| Set network w.x.y.z to be the default route (gateway of last resort) in IGRP. All routes not in the routing table will be sent to this network | Router(config)# ip default-network w.x.y.z Must have either a specific route to that network or a 0.0.0.0 /0 default route. |
| Set network w.x.y.z to be the default route (gateway of last resort) in EIGRP or RIP. All routes not in the routing table will be sent to this network | Router(config)# ip route 0.0.0.0 0.0.0.0 w.x.y.z |
| Display IP routing protocol parameters and statistics | Router# show ip protocols |
| Display Telnet negotiation process | Router# debug telnet |
| Show interface command response of "Serial n/n is 'status'" refers to what. | Refers to physical status |
| Show interface command response of "line protocol is 'status' refers to what. | Referes to logical status. |
| What Show interface command to a serial interface response means interface is up and working. | Serial 0/0 is up |
| What Show interface command to a serial interface response means keepalive or connection problem (no clockrate | bad encapsulation) |
| What Show interface command to a serial interface response means Interface problem | or other end has not been configured. |
| What Show interface command to a serial interface response means nterface is disabled or shut down. | Serial 0/0 is administratively down |
| Reset all interface counters to 0. | Router# clear counters |
| Reset specific interface counters to 0 | Router# clear counters interface type/slot |
| Turn on all possible debugging. This extremely CPU intensive. | Router# debug all |
| Turn off all possible debugging | Router# u all |
| List what debug commands are on | Router# show debug |
| Debug output will now be seen through a Telnet session (default is to only send output on Console screen) | Router# terminal monitor |
| Add a timestamp to all system logging messages | Router(config)# service timestamps |
| Add a timestamp to all debugging messages | Router(config)# service timestamps debug |
| Add a timestamp along with total uptime of router to all debugging messages | Router(config)# service timestamps debug uptime |
| Add a timestamp displaying local time and date to all debugging messages | Router(config)# service timestamps debug datetime localtime |
| Disable all timestamps | Router(config)# no service timestamps |
| Windows 2000/XP command to verify what IP settings are | C: ipconfig or ipconfig/all. |
| Windows 95/98/ME command to verify what IP settings are | C: winipcfg |
| Mac/Linux command to verify what IP settings are | #ifconfig |
| Enable the HTTP server | includ-ing the Cisco web browser user interface |
| Disable the HTTP server | Router(config-if)# no ip http server |
| Windows and UNIX/Linux command to display TCP/IP connection and protocol information. | C:netstat |
Created by:
doogie
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