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key functions of a router
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what do these components of routers do?

NVRAM
RAM(SD RAM)
Flash
ROM
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CCNA 2 Final Review

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key functions of a router switching from interfaces acting as intersection between multiple networks forwards packets to destination network
what do these components of routers do? NVRAM RAM(SD RAM) Flash ROM NVRAM: where startup config is stored RAM(SD RAM): where routing tables and mac addresses are stored (goes away when turned off) Flash: where IOS is stored ROM: a limited, stripped down IOS for emergencies
four steps to router bootup (in order) 1. power on self test (POST) 2. bootstrap check 3. loads IOS from flash 4. startup configuration from NVRAM
how do you identify a: Level 1 route ultimate route parent child ultimate: has out going interface or next hop IP level 1: classful or supernetted, ultimate child: always an ultimate route, and supernetted parent: no outgoing interface, always classful or supernetted
how do you select the routing protocol if there are more than one that lead to the same destination network? Pick the protocol with the lowest administrative distance (EIGRP)
What are the characteristics of a link-state routing protocol 1. updates are sent to everybody in a network 2. sends updates periodically/only when needed 3. complete topological view of network 4. uses dijkstra shortest route first
what information can be learned from the show ip route command? 1. which routing protocols used (can tell by administrative distance) 2. networks 3. metrics
what is the purpose of a metric in a routing protocol? to compare and determine the best route
what are the default metrics for these routing protocols: RIP EIGRP OSPF RIP: hop count EIGRP: bandwidth & delay OSPF: cost (inverse of bandwidth)
what do these metric values measure? hop count cost bandwidth hop count: how many routers are between you and the destination network cost: the value to indicate preference for a route bandwidth: speed of a link
what do these metric values measure? delay load reliability delay: the time difference of what it takes and what it should take load: the amount of data/traffic on a link reliability: the amount of errors on a link
which routing protocols support VLSM and therefore discontiguous networks? OSPF EIGRP ISIS RIPv2
which two devices can be used to connect to the internet? modem (for DCE devices) CSUDSU (digital modems)
When should these cables be used? patch (straight-through) crossover rollover patch (straight-through): unlike devicecs crossover: like devices *except computer--router or switch--hub rollover: console port on route--serial port on computer
which port should be used to configure a new router or one that has been erased? console port
how do you access these router prompt modes? user exec privilege exec global config interface user exec: (the initial mode) privilege exec: enable global config: config t interface: interface fa0/0 (or whatever interface)
what information can be obtained from the show interface fastEthernet command? the mac address of outgoing interfaces
which is the routing protocol or traffic forwarding that has the lowest overhead or uses the least resources? static route
Created by: sound_fury
 

 



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