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ENARSI > 2. EIGRP > Flashcards

2. EIGRP Flashcards

1
Q

What kind of routing protocol is EIGRP?

A

An enhanced distance vector

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2
Q

What is DUAL and what does it do?

A

Diffusing Update Algorithm, algorithm that identifies network paths, provided fast convergence by using loop free back-up paths

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3
Q

Can a border router transfer routes between ASNs?

A

Yes, but this is turned off by default

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4
Q

What are PDMs and what do they do?

A

Protocol Dependent Modules, used by EIGRP to support multiple network protocols.

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5
Q

What is the successor route?

A

The route with the lowest path metric to reach a destination

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6
Q

What is the successor?

A

The next hop router for the successor route

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7
Q

What is the feasible distance?

A

Metric value for the the lowest metric path to reach a destination

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8
Q

What is the reported distance?

A

Distance reported by a router to reach a prefix. It is the FD of an advertising router

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9
Q

What is the feasibility condition?

A

To be considered a back-up route, the RD must be lower than the FD locally.

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10
Q

What is the feasible successor?

A

A route that satisfies the feasible condition

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11
Q

How does EIGRP maintain its routes?

A

It creates its own Topology table and installs routes from the topology table into the routing table

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12
Q

What is in the EIGRP topology table?

A
  • Network prefix
  • Neighbor that advertised the prefix
  • Metris from each neighbor
  • Values used to calculate the metric (total delay, minimum bandwith, load, reliability)
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13
Q

What is the command to show the EIGRP topology?

A

show ip eigrp topology

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14
Q

Does the EIGRP topology table show all links?

A

Not by default, with the command ‘show ip eigrp topology all links’ it can be shown

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15
Q

What is the IP protocol number of EIGRP?

A

88

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16
Q

Does EIGRP use unicast of multicast?

A

Both. Multicast if possible, unicast if necessary

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17
Q

What is the IP for EIGRP?

A

224.0.0.10

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18
Q

What is the MAC for EIGRP?

A

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

19
Q

What are the type of EIGRP packets?

A
  • Hello
  • Request
  • Update
  • Query
  • Reply
20
Q

What is RTP and what does it do?

A

Reliable Transport Protocol, ensures that packets are delivered in order and that routers receive them

21
Q

What RTP values are used?

A

0 for no reply needed, all others ask for an ACK

22
Q

What packets do not need RTP acknowledgement?

A

Hello and ACK packets

23
Q

With RTP, what happens if an ACK is not received before the retransmit timer expires?

A

The router will notify the non-ack router to stop processing the multicast packets. Will start sending unicast untill they are fully synced again.

24
Q

How many times will EIGRP retry to send a packet that needs ACK?

A

16

25
Q

What EIGRP parameters must match to become neighbors?

A
  • ASN
  • Subnet
  • K values
  • Authentication parameters
26
Q

What are the two type of EIGRP modes?

A
  • Classic

- Named

27
Q

What are the three subsections of EIGRP named mode?

A
  • Address family
  • Interface
  • Topology
28
Q

How is the EIGRP router-id selected?

A

Highest UP loopback, if not highest IP

29
Q

What is the command to apply settings on all interface in the named mode?

A

al-interface DEFAULT

30
Q

What is the maximum EIGRP hop count?

A

255

31
Q

What is the default maximum EIGRP hop count?

A

100

32
Q

What is the normal formula for EIGRP?

A

10 tot de macht van 7 delay in micros
—————————— + ———————- x 256
bandwith 10

33
Q

What is the wide metric formula for EIGRP?

A

10 tot de macht van 7 delay in picos
—————————— + ———————- x 65536
bandwith 10 tot de macht van 6

34
Q

How is the delay displayed?

A

Microseconds on show interface

Tens of microseconds if configured on the interface

35
Q

What type of authentication can be used on EIGPR?

A

MD5 for classis config or MD5 & SHA265 for named config

36
Q

What is the default maximum of ECMP of UCMP?

A

4

37
Q

What is the command to change the ECMP in EIGRP?

A

maximum-paths …. under classic

maximum-paths under topology in named

38
Q

What is the variance multiplier?

A

A value that determines the value for which unequal paths can be installed in the routing table. Any feasible successors FD with a value below the variance value are installed in the RIB

39
Q

How is the variance value calculated?

A

FD x variance multiplier

40
Q

What is important to remember about the variance multiplier?

A

It rounds up to the whole number

41
Q

What is the command to adjust the variance?

A

variance

42
Q

What is the difference between Passive & Active state?

A
  • Passive is a stable topology

- Active is when a new path is calculated

43
Q

How can you check which EIGPR routes are installed in the RIB?

A

shiw ip route EIGRP

44
Q

How are routers of a different ASN displayed in the routing table and what is the AD?

A

D EX with AD 170

ENARSI (25 decks)

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