zCCNP ROUTE > EIGRP > Flashcards

EIGRP Flashcards

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1
Q

Which type of authentication supports EIGRP?

A

Only supports MD5

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2
Q

What are the requirements to became EIGRP neighbor?

A
  • Must be able to send/receive IP packets
  • The primary IP address of the interface must be in the same subnet
  • AS number must be the same
  • Connected interface must not be passive
  • Authentication must pass
  • K-values used must match
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3
Q

Which information omits the “show ip eigrp interfaces” command?

A

It omits the passive interfaces

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4
Q

Which protocol shows the passive interfaces in EIGRP?

A

Show ip protocol

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5
Q

How can you manually change the EIGRP hello and hold intervals?

A

Ip hello-interval eigrp

Ip hold-time eigrp

Interval = seconds

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6
Q

What is the default time for hello and hold intervals in EIGRP?

A

LAN > hello: 5sec ; hold: 15sec

WAN > hello: 60sec ; hold: 180sec

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7
Q

Which command is used to see in EIGRP the K-values?

A

Show ip protocols

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8
Q

How can you change the K-values?

A

Metric weights 0 1 0 1 0 0

Where the 1st value is the tos that is always 0

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9
Q

How long does the router wait to act when no hello packets are received?

A

3x hello-interval. By default 15 seconda

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10
Q

What is the EIGRP multicast address in IPv4 to send hello?

A

224.0.0.10

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11
Q

Which device is affected by the change of the hello and hold timers?

A

Hello timer > local device

Hold timer > the neighbors

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12
Q

Which commands can you use to verify the hello and dead intervals in EIGRP?

A
  • show ip eigrp interface detail

* show ip eigrp neighbors (no muestra el tiempo exacto sino un contador)

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13
Q

What are the uses of DUAL?

A
  • Determine the best loop-free path
  • Determine the backup loop-free path
  • Provide fast convergence
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14
Q

What is the IP protocol number of EIGRP?

A

88

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15
Q

What type of protocol is EIGRP?

A

Distance vector

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16
Q

What are the 3 steps in EIGRP to provide network convergence?

A
  1. Neighbor relationship
  2. Topology exchange information
  3. DUAL to populate the routing table
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17
Q

In EIGRP, what are the purposes of the hello packets?

A
  1. Discover new neighbors

2. To maintain the neighborship

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18
Q

What is the importance of enable the authentication in a routing protocol?

A

This helps to prevent a Denial of Service (DoS) attack

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19
Q

If in EIGRP you have the following commands:
R1 > “key chain CCNP”

R2 > “key chain Cisco”
Do you think that this could work? And why?

A

Yes, because the name or string only have a locally importance

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20
Q

In EIGRP, how would you configure the authentication?

A 
Key chain "string"
     Key 1
            Key-string "string"
Interface fastEthernet 0/1
     Ip authentication mode eigrp 1 md5
     Ip authentication key-chain eigrp  "key-chain-string"
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21
Q

If in EIGRP you have multiple active/valid keys at the same time, which key would be used to generate the MD5 digest to send EIGRP packets?

A

The key with the lowest key number value

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22
Q

In EIGRP how can you check the key chain configuration?

A
  • “show key chain “

* “debug eigrp packet”

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23
Q

Can you configure key chain to use time-based logic?

A

Yes

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24
Q

In EIGRP if you wanted to use different keys during different time periods what would you need to do on router so this configuration could work?

A

The clocks must be set to use the same time, using and NTP or manually through the “clock set” command

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25
Which commands you have to use to configure the key chain to use time-based logic?
- accept-lifetime... | - send-lifetime...
26
What do you need to do to use different keys during different time periods?
The clocks must be set to use the same time. You can configure it manually or using a NTP server (preferred).
27
Which command you have to use to update the router clock manually?
"Clock set" command
28
In EIGRP, what are the 2 ways that a router has to advertise its connected routes?
1. Using the "network" command | 2. Using the "redistribute connected" command
29
What are the advantages and disadvantages of using the "redistribute connected" command?
Advantage: - you don't have to use the "passive interface" command Disadvantage: - you send this routes as external routes
30
How do you configure passive interfaces one by one in EIGRP and all at the same time?
Router eigrp Passive-interface OR Passive-interface default
31
Which K values does EIGRP uses by default?
Bandwidth (K1) and delay (k3)
32
How many K values are in EIGRP?
5
33
What values can have the K-values in EIGRP?
1 and 0
34
What is the Administrative Distance (AD) of EIGRP?
Internal EIGRP: 90 External EIGRP: 170
35
It is recommended to change the K-values?
No
36
You only can configure one key for all the time periods. True or false?
False. You can have multiple keys for different time periods
37
For which reasons the EIGRP neighbors can be configured statically?
- L2 media doesn't support broadcast - to ensure that no other device can intercept the EIGRP packets sent to multicast addresses between devices. (A security reason)
38
How can you configure the neighbors statically in EIGRP?
Router eigrp | Neighbor
39
What are the caveats or disadvantages of configuring static neighbors in EIGRP?
- all multicast processing for EIGRP on that particular interface is disabled - if existing neighbors were formed using multicast, they will go down - All the neighbors on that interface must be statically defined
40
With which command can you verify the static neighbors?
"Show ip eigrp neighbors detail"
41
For what is used the Router-ID?
Is used to prevent external routing loops
42
If 2 routers have the same EIGRP router-id what could happen?
- They won't be able of becoming neighbors | - Routers won't accept external updates that have the same router-id
43
What are the characteristics of the EIGRP neighbors over MPLS L3VPN?
- Neighbors are formed with the service provider's PE router - No neighbor relationship is required with all the remote offices/branches/sites or data center - It uses Virtual Routing & Forwarding (VRF)
44
What are the characteristics of EIGRP neighbors over Ethernet?
- Is like building a neighbor over a LAN segment | - MetroEthernet configuration is irrelevant to us
45
What are the characteristics of EIGRP neighbors over Frame Relay?
- FR provides layer 2 WAN services - Neighbors can be formed with any router that connects to the FR cloud - The port can be configured as point-to-point or multipoint (sub or physical interface) - It can be dynamic or static neighbor discoveries, depending on the FR cloud - There is one significant problem with EIGRP neighbors over FR: split horizon ⛔️ - A single physical interface from the router connected to the FR cloud, the split horizon became a problem
46
What does a router after forming an EIGRP neighbor relationship?
They exchange neighbors topology tables
47
Which information keeps the EIGRP topology table?
Prefix Prefix length Metric information Etc
48
What are the 2 ways that a router can use in EIGRP to add routes into its local topology table?
- Prefixes of connected subnets that are matched using the "network" command - Prefixes that are redistributed into EIGRP
49
What are the 5 types of protocol messages in EIGRP?
- Hello - Update - ACK (acknowledgement) - Query - Reply
50
Which types of messages does EIGRP uses for topology exchange?
- Update | - ACK
51
What information contain the EIGRP update messages?
- Prefix - Prefix length - Metric components: bandwidth, delay, load and reliability - Non metric components: MTU and hop count
52
How is the EIGRP update process?
- When neighbors come up, the routers exchange full topology tables with each table - When full topology exchange is done, there is NO period of re-flooding of topology table data - If something change only a partial update is sent about the prefix that was affected with a network change - If a neighbor fails and then recovers, the full topology table is exchanged with it again
53
An update process in EIGRP can be done for a metric value change?
Yes
54
You have to enable split-horizon in EIGRP?
No, it is enable by default
55
Which protocol does EIGRP uses to send updates and ACK messages?
EIGRP uses RTP ( Reliable Transport Protocol)
56
How is the update process in EIGRP on multi-access network?
Typically send update messages to multicast address 224.0.0.10 and expect unicast EIGRP ACK message from each neighbor
57
What is the problem when the split-horizon is enable in EIGRP?
The issue happen when we use FR and we have multipoint interfaces. This cause that the update messages can't be send to all the neighbors
58
How can you disable the split-horizon in EIGRP?
"No ip split-horizon eigrp " Interface subcommand On RIP "No ip split-horizon"
59
Which percentage of bandwidth uses EIGRP for the update messages?
50% of interface bandwidth by default
60
From where EIGRP take as reference the 50% of bandwidth for updates?
From the "bandwidth" command, it uses the 50% of this value
61
How can you change the percentage uses by EIGRP for the update messages?
Using the "ip bandwidth-percent eigrp " command
62
How the bandwidth percentage works in EIGRP when we have PVCs?
The bandwidth of the interface is distributed in an equal way for all PVCs, but you can't define different bandwidth to each PVC
63
What is the feasible distance (FD)?
From the local router's perspective, the metric value for a route, used by this local router, to choose the best route for that prefix
64
What is the Reported Distance (RD) or Advertise Distance (AD)?
From the local perspective is the metric reported by the neighbor to reach a route.
70
In this example which is the feasible distance and the reported distance? 10.10.10.0/24 via 18.19.18.18 (668160/640256)
Feasible distance: 668168 (metric) | Reported distance: 640256
71
What are the ways to manipulate your the EIGRP metric value?
- Changing bandwidth and/or delay values | - Using offset-list
72
It is recommended to change the bandwidth value to manipulate the metric? Yes or not, and why?
It is not recommended because changing the bandwidth may also affect other things as QoS, queuing, shaping, etc
73
What happen when you change the bandwidth and/or delay on an interface?
It changes the metric value for all the routes reachable out of that interface
74
Changing the bandwidth or delay affect the FD and RD?
No, it only affects the FD
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