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ENARSI > Chap 2 - EIGRP > Flashcards

Chap 2 - EIGRP Flashcards

1
Q

What are 5 characteristics of EIGRP?

A

* Fast convergence * Uses neighbors and Hello messages * Composite metric * Only sends update messages when there’s a change * Equal and Unequal cost load balancing

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2
Q

What 4 characteristics describe an EIGRP Autonomous System?

A

* A single router can run multiple EIGRP instances * Represents a common router domain * Routers exchange routes only with other routers in its AS * All routers in an AS use the same metric calculation formula

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3
Q

What is an EIGRP PDM and what is its function?

A

* Protocol Dependent Module - each routed protocol has its own PDM. * IPV4 * IPV6

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4
Q

What is a Successor Route?

A

The route with the lowest path metric to reach a destination.

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5
Q

What is a Successor?

A

The first next-hop router for the successor route.

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6
Q

What is the Feasible Distance (FD)?

A

The metric value for the lowest-metric path to reach a destination.

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7
Q

What is the Reported Distance (RD)?

A

Distance reported by a router to reach a prefix. The reported distance value is the feasible distance for the advertising router.

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8
Q

What is the Feasible Condition?

A

For a route to be considered a backup route, the RD received for that route must be less than the FD calculated locally. This logic guarantees a loop-free path.

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9
Q

What is a Feasible Successor?

A

A route with that satisfies the feasibility condition is maintained as a backup route. The feasibility condition ensures that the backup route is loop free.

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10
Q

What 4 items are in the Topology Table?

A

* Network prefix * EIGRP neighbors advertising that prefix * Metrics from each neighbor (RD and hop count) * Values used by the neighbor when calculating the metric

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11
Q

In the topology table what are the 2 numbers in parenthesis?

A

( FD / RD ) The local router’s Path Metric if it were to use that route / The RD or the neighbors feasible distance to the destination

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12
Q

What is EIGRP’s multicast MAC address?

A

01:00:5e:00:00:0a

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13
Q

With is EIGRP’s multicast address?

A

224.0.0.10

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14
Q

What is EIGRP’s port number?

A

IP 88

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15
Q

What are EIGRP’s 5 message types?

A

* Hello * Query * Request * Update * Reply

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16
Q

When is the Query message sent?

A

When EIGRP is searching for another path during convergence

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17
Q

What protocol does EIGRP use for reliable communication?

A

Reliable Transport Protocol (RTP)

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18
Q

How does RTP ensure reliable communication?

A

* Ensures packets are delivered in order * Ensures routers receive specific packets * Sequence number of 0 does not require an acknowledgement * All other sequence numbers require an ACK

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19
Q

Which message types are considered reliable and which are not?

A

* Update, query, reply, and unicast packets are reliable and require an ACK * Hello’s and ACKs are not reliable

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20
Q

What happens if an originating router doesn’t receive an ACK before the retransmit timeout timer expires?

A

* Originating router notifies non-acknowledging router to stop processing multicast packets and switch to unicast * Routers then communicate via unicast until neighbor is fully synchronized * Once synchronized the originating router notifies the neighbor to return to multicast

21
Q

How many times will EIGRP retry?

A

16 times

22
Q

What does EIGRP do if, after 16 attempts, it doesn’t receive an ACK?

A

It resets the neighbor relationship

23
Q

What is the difference between RTP and other reliable-transport protocols like TCP?

A

RTP supports multicast, the others do not.

24
Q

What 4 parameters must match before EIGRP neighbors can form?

A

* K-values * Primary subnet * ASN * Authentication parameters

25
Q

5 Benefits of EIGRP Named Mode

A

* All EIGRP configuration occurs in one location* Supports current EIGRP features and future developments. * Supports multiple address families (including Virtual Routing and Forwarding [VRF] instances) * EIGRP named configuration is also known as multi-address family configuration mode * Commands are clear in terms of the scope of their configuration.

26
Q

What are the 3 subsections of EIGRP Named Mode?

A

* Address family * Topology * Interface

27
Q

What 4 things can be configured in the Address family subsection?

A

* Network statements * K-values * Logging settings * Stub settings

28
Q

In the Interface Subsection what are 2 ways to assign commands to interfaces?

A

* By specifying the interface and making changes to that one interface * By specifying ‘default’ which will apply the settings to all EIGRP interfaces

29
Q

In the Interface Subsection what 4 things can be configured?

A

* Hello interval * Split horizon * Summary routes * Authentication settings

30
Q

In the Topology Subsection what 2 things can be done?

A

* Redistribution * Administrative Distance settings

31
Q

What are 3 steps in enabling EIGRP Named Mode on an interface?

A

* Initialize the EIGRP process R1(config)# router eigrp NAME * Select the address-family and create the ASN - R1(config-router-af)# address-family ipv4 autonomous-system 1 * Select the interface with the network cmd R1(config-router-af)# network 10.20.30.0 0.0.0.255

32
Q

If you have a router running EIGRP Named Mode with an AS of 12 can the configuration be changed without having to go through the address-family?

A

No, classic mode and named mode are independent. Even if the ASN is the same you can’t make changes to Named Mode using Classic Mode commands

33
Q

What does the network command do?

A

Selects the interface whose connected network will be added to the topology table and be advertised

34
Q

How are secondary networks added to the EIGRP Topology Table?

A

They must be redistributed into it.

35
Q

What network statement would enable EIGRP on all interfaces?

A

network 0.0.0.0 255.255.255.255

36
Q

What is the command to set the router ID?

A

R1(config-router)# eigrp router-id 1.1.1.1

37
Q

In EIGRP Named Mode under af-interface submode which commands take precedence - those under af-interface default or those under af-interface gig0/1?

A

af-interface gig0/1 will over-ride anything in Default

38
Q

Does a passive-interface show up in ‘show ip eigrp interfaces’ ?

A

No

39
Q

What does EIGRP authentication encrypt?

A

Just the password

40
Q

What are the 3 steps for creating a keychain for EIGRP authentication?

A

* Create the key-chain R1(config)# key chain MYKEY * Assign a key identifier R1(config-keychain)# key 1234 * Assign a key string R1(config-keychain-key)# key-string cisco

41
Q

In EIGRP classic mode what 2 commands go on the interface to enable authentication?

A

* ip authentication key-chain eigrp 4 MYKEY * ip authentication mode eigrp as 4 md5

42
Q

In EIGRP named mode what 2 commands go on the interface to enable authentication?

A

* R2(config-router-af-interface)# authentication mode md5 * R2(config-router-af-interface)# authentication key-chain MYKEY

43
Q

What are EIGRP Wide Metrics scaled by?

A

65,535

44
Q

In EIGRP Wide Metrics what is latency measured in?

A

picoseconds

45
Q

What 3 things changed with Wide Metrics?

A

* Scaled by 65,535 * Delay measured in picoseconds * Added another k-value k6

46
Q

What is the fastest link EIGRP Wide Metrics can support?

A

4.2 Tbps

47
Q

What is the command to change the K values in Named Mode?

A

R1(config-router-af)# metric weights

48
Q

How is variance calculated for unequal cost load balancing?

A

Feasible Successor FD / Successor FD

ENARSI (6 decks)

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