EIGRP Questions
| EIGRP Quick Summary: + EIGRP supports up to six unequal-cost paths. + EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command. + The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route. + The path that meets the feasibility condition requirement is called a feasible successor |
Question 1
Explanation
By default, EIGRP load-shares over four equal-cost paths. EIGRP also support unequal-cost load balancing via the “variance” command.
Question 2
Explanation
The table below lists the default administrative distance values of popular routing protocols:
| Routing Protocols | Default Administrative Distance |
| EIGRP | 90 |
| OSPF | 110 |
| RIP | 120 |
| eBGP | 20 |
| iBGP | 200 |
| Connected interface | 0 |
| Static route | 1 |
Question 3
Explanation
Requirements
+ The time must be properly configured on all routers.
+ A working EIGRP configuration is recommended.
Question 4
Explanation
The following list of parameters must match between EIGRP neighbors in order to successfully establish neighbor relationships:
+ Autonomous System number.
+ K-Values.
+ If authentication is used both: the key number, the password, and the date/time the password is valid must match.
+ The neighbors must be on common subnet (all IGPs follow this rule).
Question 5
Explanation
When EIGRP is configured in a point-to-multipoint Frame Relay network, although the Hub can receive routing updates sent from its Spoke routers but split horizon rule forbids the Hub from relaying advertisements back out the interface on which they were received. For example in the topology below, Hub can receive routing updated from two Spokes but it cannot relay them out of S0/0 interface again (as it is the interface where it received the updates). To solve this problem we need to disable split horizon on S0/0 interface of Hub.
The command should be (suppose EIGRP 1 is running):
| Hub(config)#interface serial0/0 Hub(config-if)#no ip split-horizon eigrp 1 |
Therefore answer A is correct.
In Non-broadcast networks (such as Frame-Relay), multicast (and broadcast) are not allowed while EIGRP (and OSPF, RIPv2) uses multicast to send Hello and Update messages. Therefore these dynamic routing protocols would not work well under Frame-Relay. To overcome this issue we usually add the keyword “broadcast” at the end of the frame-relay map statement (for example, “frame-relay map ip 10.1.1.1 403 broadcast“). This makes EIGRP to send update via unicast instead of multicast.
Another way to resolve above issue is to use the “neighbor” command. This command also make EIGRP to communicate with its neighbors via unicast -> B is correct.
Note: Although we can use the “neighbor” command to set up EIGRP neighbor relationship but the routes cannot be advertised from the Hub to the Spoke because of split horizon rule.
Question 6
Explanation
Although we can use the “neighbor” command to set up EIGRP neighbor relationship but the routes cannot be advertised from the Hub to the Spoke because of split horizon rule -> Answer D is not correct.
To overcome the split horizon rule we can use subinterface as each subinterface is treated like a separate physical interface so routing updates can be advertised back from Hub to Spokes. -> Answer C is correct.
Note: The split horizon rule states that routes will not be advertised back out an interface in which they were received on
Question 7
Explanation
The “ip summary-address eigrp” command is used to configure interface-level address summarization. EIGRP summary routes are given an administrative distance value of 5. The administrative distance metric is used to advertise a summary without installing it in the routing table.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1.html
Question 8
Question 9
Explanation
An example of how to configure EIGRP authentication on two routers that are connected to each other is shown below:
R1,R2(config)#key chain MYKEYS
R1,R2(config-keychain)#key 1
R1,R2(config-keychain-key)#key-string SecRetThing!
R1,R2(config-keychain-key)#end
R1,R2(config)#interface serial 0/0
R1,R2(config-subif)#ip authentication mode eigrp 10 md5
R1,R2(config-subif)#ip authentication key-chain eigrp 10 MYKEYS
Question 10
Explanation
When redistributing into RIP, EIGRP (and IGRP) we need to specify the metrics or the redistributed routes would never be learned. In this case we need to configure like this:
| router eigrp 1 redistribute ospf 100 metric 10000 100 255 1 1500 |
Question 11
Where is question please?
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Which two reasons fir IP SLA tracking failure are likely true?
in some dumps I found A,C and others BE
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Which two options are requirements for EIGRP authentication? (Choose two)
A. A crypto map must be configured.
B. The Authentication key must be configured under the interface running EIGRP.
C. The authentication key must be configured within the EIGRP routing configuration.
D. The authentication key IDs must match between two neighbors.
E. A separate key chain must be configured.
F. AN IPsec profile must be configured.
Ans: B,D.
‘B’ is not quite precise because de Auth Key is configured under the key chain.
‘D’ is tottaly true, the key ID is sent with the EIGRP packet and is used by the other side to identifies the key-string to use.
‘E’ is wrong because is not mandatory to configure an exclusive key chain for EIGRP, the same key-chain can be shared with RIPv2.
Which command prevents routers from sending routing updates through a router interface?
A. default-metric 0
B. distribute-list in
C. passive-interface
D. distribute-list out
Answer is suppose to be C passive-interface, but distribute-list in could also used? Thoughts?
distribute-list out command is configured inside ospf configuration and it prevents routes from going out of OSPF routing protocol and is not specific to an interface.
but a nice question though
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Question 3 must be: Time instead of password I think:
Requirements
The time must be properly configured on all routers. Refer to Configuring NTP for more information. For the authentication keychains with keys are used. The term password is not mentioned in the cisco documentation.
Question 3 must be: Time instead of password
I think the same….In other documents the answer is TIME.
thanks Cool guy
why I cant see any questions…
Q3: D. Time
Requirements:
The time must be properly configured on all routers. Refer to Configuring NTP for more information.
A working EIGRP configuration is recommended
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/82110-eigrp-authentication.html
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Q5. Asks about adjacencies, not routing updates. Split-Horizon has nothing to do with forming a adjacencies.
Q6. I be interested to hear others opinion in this. As far as I can see ‘A’ is correct but ‘C’ is only correct if you concede that you are your are changing a multi-point topology into a partial mesh point to point topology.
Q4. Answer is “time” instead of “password”
“Q5. Asks about adjacencies, not routing updates. Split-Horizon has nothing to do with forming a adjacencies.” – 1Way
Agreed. Something is wrong with this question or answer choices. ‘A’ is not a valid answer for bringing up the adjacency. In addition to neighbor command, couldn’t you have a frame-relay map with the “broadcast” keyword to facilitate the 224.0.0.10 hello packets?
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Agree, Q3 is “time”
They’re talking about rollover and besides, passwords don’t have to be the same on all routers.
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what’s the correct answer in Q3, time or password?
can anyone explain q2?
HEY DIGITALTUT. please tell us what answer we have to select in exam TIME or PASSWORDS
Question 3
Other than a working EIGRP configuration, which option must be the same on all routers for EIGRP authentication key rollover to work correctly?
A. SMTP
B. SNMP
C. Passwords
D. Time
Answer: D
Here the questions: http://www.mediafire.com/file/sha2qvcgaicsc2r/ROUTE_Jan_2018.pdf
Plead read ROUTE FAQs & Tips, or any others FAQs.
Hey DIGITALTUT, i have the same Question that Rizwan, Could you please help us?
Thnx
It is TIME. Option D.
The time must be properly configured on all routers. Refer to Configuring NTP for more information.
A working EIGRP configuration is recommended.
https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/82110-eigrp-authentication.html
What about Q9, why D (The authentication key IDs must match between two neighbors.) is correct?
The Official Cert Guide says:
“A key string specifies a preshared key to be used between routers. Therefore, the
key string must match on two routers for them to mutually authenticate. The key
chain name and key number values are locally significant and do not have to match
on a neighboring router.”
Can anyone clear this up?
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In addition to Q9. There is an errata in OFG, see the discussion https://learningnetwork.cisco.com/thread/61271
So, key number MUST match and D is correct answer.
Can someone please explain Q4?
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sha+md5 (a and b)
Hello!
About Q6: why variants A and C are correct, I think correct are A and D. Q6 is the similar as Q5, and in Q5 we use variant with statically neighbor command, but in Q6 we don’t use it, why?
“The router needs to know the time to be able to rotate through keys in synchronization with the other participating routers, so that all routers are using the same key at the same moment. Refer to the Network Time Protocol (NTP) and calendar commands in the “Performing Basic System Management” chapter of the Cisco IOS Configuration Fundamentals Configuration Guide for information about configuring time on your router.”
http://www.ciscopress.com/articles/article.asp?p=687478&seqNum=4
@Dmitri, yes the same think i’ve immediately thought after read them, very strange, someone can clarify about question 5-6?
Q6 is AC or AD?
Thanks
Question 6
In a point-to-multipoint Frame Relay topology, which two methods ensure that all routing updates are received by all EIGRP routers within the Frame Relay network? (Choose two)
So, in that question adjacency is already establish and the issue is to exchange the EIGRP routers:
1. for point-to-multipoint ( int serial5/0; ip address 192.168.1.1 255.255.255.0) the only way is to run or and affect both RIP and EIGRP (if RIP is also running there)
2. for point-to-multipoint interface with sub-interface (Router(config)#int s5/1.1 point-to-point; ip address 192.168.1.1 255.255.255.0; int s5/1.2 point-to-point …) multipoint link became several point-to-point links, so is no need for command.
Summary: Answers A & C
Point D is reffering only to how can create relationship with EIGRP neighbors
point 1 was not saved correctly:
for affect only EIGRP
command affect both RIP & EIGRP
in Frame Relay point-to-multipoint network is not possible to encountered “root loops”, because of the topology, so this command(no ip split-horizon) is safe to run.
Point 1
no ip split-horizon eigrp AS Num
no ip split-horizon
Probably because i use
Please give me the question. Thank you.