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Cisco CCNA 200-301 > IPv4 Routing > Flashcards

IPv4 Routing Flashcards

1
Q

What is a routing table

A

is a list of routes to known networks. This information is gathered from directly connected networks, static routes, and dynamic routing protocols.

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2
Q

What is a routing source with the code L

A

Local router interface

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3
Q

What is a routing source with the code C

A

a directly connected network

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4
Q

What is a routing source with the code S

A

a static route used to reach a certain network

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5
Q

What is a routing source with the code P

A

a dynamic network learned using the OSPF routing protocol

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6
Q

What is a routing source with the code R

A

a dynamic network learned using the RIP routing protocol

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7
Q

What is Administrative distance

A

is a description of the trustworthiness or preferability of a route

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8
Q

What is Prefix and prefix length

A

The network address and subnet address for the destination route

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9
Q

What is a metric

A

identifies how far away the destination is, either in distance or time. The lower the metric, the higher the preference of the route.

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10
Q

What is next-hop

A

The next-hop is the IP address of the next router that the packet will be forwarded to.

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11
Q

What is the Route timestamp

A

The route timestamp indicates how much time has passed since the route was learned.

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12
Q

What is the Exit interface

A

The interface used for sending packets to their destination.

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13
Q

What is the longest match when it comes to routers

A

Its the route (IP address) that has the most matching bits from left to right

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14
Q

Once the router has calculated the best path, describe what would happen if it chose the Directly connected networks

A

the router will forward the packet to the directly connected device on that network.

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15
Q

Once the router has calculated the best path and chooses the Remote network what will happen next

A

the router will forward the packet to a next-hop router. Remote routes can be added to the routing table manually or dynamically. Manually added routes are referred to as static routes

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16
Q

Once the router has chose the default route what happens next

A

If there is no match found in the routing table, the packet will be dropped. This can be avoided by setting a default route in hopes that the next device will have more information on the intended destination. Default routes can be entered manually or can be obtained via dynamic routing protocols.

17
Q

What is Packet forwarding

A

to place packets into the correct data link frame type for the outgoing device.

18
Q

What is the first step in the packet forwarding decision process

A

The data link frame arrives with an encapsulated IP address

19
Q

What is the second step in the packet forwarding decision process

A

The router examines the destination address and refers to its routing table

20
Q

What is the third step in the packet forwarding decision process

A

The router finds the longest match in the routing table

21
Q

What is the fourth step in the packet forwarding decision process

A

The router encapsulates the packet in a frame with the updated routing information

22
Q

What is the fifth step in the packet forwarding decision process

A

If there is no matching route entry, the packet is dropped

23
Q

Describe process switching

A

the earliest Cisco route processing implementation. Process switching required the router to process each received frame individually using the steps outlined above.

24
Q

Describe fast switching

A

processes packets in the same manner as process switching; however, it incorporates several mechanisms designed to optimize the process, caches frequently used data link headers and recently used destinations.

25
Q

Describe Cisco Express Forwarding (CEF)

A

an advanced routing mechanism designed to optimize packet processing in very large networks. CEF increases packet switching speed and reduces the overhead introduced by other routing techniques

26
Q

What is administrative distance

A

a value used to rank route sources

27
Q

How many points does the Connected route source have

A

0

28
Q

How many points does the Static route source have

A

1

29
Q

How many points does the EIGRP route source have

A

5

30
Q

How many points does the External BGP route source have

A

20

31
Q

How many points does the Internal EIGRP route source have

A

90

32
Q

How many points does the IGRP route source have

A

100

33
Q

How many points does the OSPF route source have

A

110

34
Q

How many points does the IS-ISroute source have

A

115

35
Q

How many points does the RIP route source have

A

120

36
Q

How many points does the External EIGRP route source have

A

170

37
Q

How many points does the Internal BGP route source have

A

200

Cisco CCNA 200-301 (53 decks)

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