Discuss CompTIA N10-009 Exam Topic 1 Question 35

Due to concerns around single points of failure, a company decided to add an additional WAN to the network. The company added a second MPLS vendor to the current MPLS WAN and deployed an additional WAN router at each site. Both MPLS providers use OSPF on the WAN network, and EIGRP is run internally. The first site to go live with the new WAN is successful, but when the second site is activated, significant network issues occur. Which of the following is the most likely cause for the WAN instability?

AA changed CDP neighbor

BAsymmetrical routing

CA switching loop

DAn incorrect IP address

Suggested Answer: B

Asymmetrical routing occurs when packets take different paths to and from the destination, leading to instability in network communication. The use of two different MPLS providers with OSPF can lead to this type of routing issue, especially if the paths aren't carefully configured and managed. This can cause unexpected routing behaviors and instability in a dual-WAN setup. (Reference: CompTIA Network+ Study Guide, Chapter on Network Routing)

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12 comments · newest first

Glendora 3 months ago

I'm leaning towards D) An incorrect IP address. That could definitely cause instability.

Fletcher 3 months ago

I agree, B makes sense. Different paths can confuse the routing.

Tamekia 3 months ago

I think it's B) Asymmetrical routing. That can cause major issues.

Linette 3 months ago

Could be a mix of issues, but I lean towards asymmetrical routing.

Thaddeus 3 months ago

Definitely a CDP neighbor change causing confusion.

Tresa 4 months ago

Surprised they didn't catch the IP address issue before going live!

Tesha 5 months ago

I disagree, a switching loop seems more likely here.

Jess 5 months ago

Sounds like asymmetrical routing could be the culprit.

Reita 6 months ago

I’m not entirely confident, but I feel like the CDP neighbor change might not be the main issue. Asymmetrical routing sounds more likely based on what I practiced.

Ria 6 months ago

I'm leaning towards an incorrect IP address being the problem. It seems like a common mistake when adding new routers, right?

Tula 6 months ago

I think I saw a practice question about switching loops causing instability. Could that be a possibility in this scenario?

Lovetta 7 months ago

I remember studying OSPF and EIGRP interactions, but I'm not sure how they handle multiple WANs. Could asymmetrical routing be the issue here?

CompTIA N10-009 Exam - Topic 1 Question 35 Discussion