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200-301 Exam - Question 494


Refer to the exhibit. An OSPF neighbor relationship must be configured using these guidelines:

✑ R1 is only permitted to establish a neighbor with R2.

✑ R1 will never participate in DR elections.

✑ R1 will use a router-id of 10.1.1.1.

Which configuration must be used?

A.

B.

C.

D.

Show Answer
Correct Answer:

The proper configuration to meet the criteria is option A. R1 should use a router-ID of 10.1.1.1, which matches the configuration in option A. Additionally, to prevent R1 from participating in the DR election, the OSPF priority is set to 0. The access list in option A is correctly configured to permit OSPF traffic only between R1 and R2 and deny it from other potential neighbors. In contrast, other options either have incorrect OSPF priority settings or use invalid router ID configurations.

Discussion

12 comments
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g_mindset
Sep 3, 2022

OSPF uses port 89 and does not use a transport protocol. A is the answer. EIGRP port 88.

EthanhuntMI6
Dec 23, 2022

Thank you.

f2killer
May 19, 2023

if this is the right answer how the router id is gonna be 10.1.1.1?? In answer D the router id it will assign the loopback.

f2killer
May 19, 2023

iam wrong. i see now router id ...

PerryThePlatypus
Nov 1, 2023

The port 88 is not even among the well-known ports, and if you search for the OSPF protocol in the official documentation, it doesn't mention port 88 for the passage of the relevant packets... but i mean, now you know it...

PerryThePlatypus
Nov 1, 2023

Sorry, i mean "Port 89"

daddydagoth
Feb 20, 2023

Another thing wrong with answer D is that the command "ospf router ID" is wrong. EIGRP's command is "EIGRP router ID", OSPF uses "Router ID"

[Removed]
May 13, 2023

B, C, D all use ospf router ID.

kyleptt
Jul 14, 2023

Setting the Ospf priority as zero is the reason why A is the answer.

Dadits
Jan 15, 2024

command is router id no ospf router id you can justify the answer just from this!Save time!

Olebogeng_G
Jun 8, 2023

Where is the exhibit?

[Removed]
Jun 22, 2023

It's missing :(

ccnk
Jun 18, 2023

There is no exhibit.

Junior_Network
Oct 18, 2023

we don't need at all

SeMo0o0o
Mar 20, 2024

A is correct OSPF uses port 89 OSPF uses command: router-id EIGRP uses Command: EIGRP router-id

OrwellMB
Jul 3, 2023

Exhibit is: R1 -> Fa0/0 ".1" connection line: 10.100.1.0 R2 -> Fa0/0 ".2" that's it, no other info

Mattschwim
Oct 25, 2023

contact to get full questions <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="64090510100d100d17240b1110080b0b0f4a070b09">[email protected]</a>

PyoJH
Nov 27, 2023

I understand that A is the answer. By the way, is it possible to establish an ospf relationship between R1 and R2 if the ACL is applied properly? R1 receives R2's hello packet, but R1 can't send hello packets because of deny 89 any any, so isn't the relationship not established?

ShanRamu
Jul 4, 2024

Answer is A no DR election so priority should be 0, which leads us to A and D only advertise to R2, so this leaves loopback, giving the answer A

MinSun600
Jul 21, 2024

what is host 224.0.0.5 is that the subnet mask it can't be the wiled card someone tell me please