chp 1 routing concepts Flashcards

1
Q

network characteristics

A
  • topology
  • speed
  • cost
  • security
  • availability
  • scalability
  • reliability
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2
Q

router job

A

-routing traffic between networks

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3
Q

router components

A
  • cpu
  • memory and storage
  • operating system
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4
Q

router memory

A
  • ram (random access)
  • rom (read only)
  • nvram (non-volatile random access)
  • flash
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5
Q

random access memory (ram)

A
  • volatile
  • runs ios
  • running config
  • ip routing and arp tables
  • packet buffer
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6
Q

read only memory (rom)

A
  • non volatile
  • bootup instructions
  • diagnostic software
  • back up ios
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7
Q

non volatile random access memory (nvram)

A
  • start up config

- non volatile

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8
Q

flash

A
  • non volatile
  • stores ios
  • system related files
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9
Q

packet forwarding methods

A
  • process switching
  • fast switching
  • cisco express forwarding (cef)
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10
Q

process switching

A
  • every packet is processed by the cpu
  • destination ip address
  • route table entry
  • exit interface
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11
Q

fast switching

A
  • next hop is stored in cache
  • first packet is processed by cpu
  • other packets with the same destination are sent to cache not cpu
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12
Q

cisco express forwarding (cef)

A
  • fastest
  • packets are change triggered
  • forward information base (fib) and adjacency table forward packets
  • fib and adjacency table populated when routers learn of other routers
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13
Q

to have network access devices must have

A
  • ip adress
  • subnet mask
  • default gateway
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14
Q

network documentation should include

A
  • topology diagram

- addressing table

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15
Q

svi

A
  • switch virtual interface

- used for management ip address

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16
Q

basic router settings

A
  • name the device
  • secure management access
  • configure a banner
  • save configuration
17
Q

router interface must have

A
  • ip address
  • subnet mask
  • not shutdown
  • clock rate configured on serial cable end labeled dce
18
Q

loopback interfaces

A
  • logical
  • internal to router
  • not physical port
  • automatically up
  • useful for testing
  • important to ospf routing
19
Q

show commands

A
  • verify operation

- configuration of interface

20
Q

filter show commands

A
  • | pipe character

- followed by perameter

21
Q

packet forwarding process for directly connected interface

A
  • arrives at interface
  • searches routing table for match
  • does destination ip match subnet of directly connected interface
  • check arp cache and forward to host on local subnet
22
Q

packet forwarding process for remote network and gateway of last resort

A
  • arrives at interface
  • searches routing table for match
  • does destination ip match subnet of remote network/gateway of last resort
  • encapsulate frame and forward out of exit interface to the next hop
23
Q

best path

A
  • chosen by routing protocol

- based on metric used to determine distance to reach a network

24
Q

ipv4 dynamic routing protocols

A
  • router information protocol (rip)
  • open shortest path first (ospf)
  • enhanced interior gateway routing protocol (eigrp)
  • intermediate system to intermediate system (is-is)
25
Q

rip metric

A

-hop count

26
Q

ospf metric

A

-cumulative bandwidth

27
Q

eigrp metric

A
  • bandwidth
  • delay
  • load
  • reliability
28
Q

load balancing

A
  • when a router has two or more path whose metrics are equal
  • router forwards packets using both paths
  • improves performance
29
Q

administrative distance

A
  • router value for best path
  • 0 and up
  • router with multiple paths to the same destination the path with lowest administrative distance is installed in routing table
30
Q

routing table

A
  • stored in ram
  • directly connected routes
  • remote routes
31
Q

types of routes

A
  • local route interfaces
  • directly connected interfaces
  • static routes
  • dynamic routes
32
Q

static routes

A
  • configured manually
  • define explicit path between two devices
  • manually updated
  • improved security
  • improved control of resources
33
Q

dynamic routing

A
  • routers exchange info
  • automatically populate routing tables
  • creates converged network
34
Q

ipv6 dynamic routing protocols

A
  • ospfv3
  • ripng (next generation)
  • eigrp for ipv6