Implementing a Dual-Homed WAN Connection: Benefits and Advantages

Benefits of a Dual-Homed WAN Connection

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Question

Which benefit of implementing a dual-homed WAN connection instead of a single-homed connection is true?

Answers

Explanations

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A. B. C. D.

B

A dual-homed WAN connection refers to a setup where a router or network device has two physical connections to two different WAN service providers, which are then used to provide redundancy and/or load balancing. In contrast, a single-homed connection refers to a setup where a router or network device has only one connection to a WAN service provider.

Of the four answer choices given, option B is the correct one. Here is a more detailed explanation of each option:

A. Recursive routing is a technique used in routing protocols where the router sends a packet to another router to determine the best path to a destination network. This option is incorrect because recursive routing is not unique to dual-homed connections; it can be used with both single-homed and dual-homed connections.

B. Dual-homed connections provide redundancy and enable a router to tolerate the loss of a network link. If one of the WAN links fails, the router can continue to send traffic over the other link. In contrast, with a single-homed connection, if the WAN link fails, the router has no other path to send traffic to the destination network. Therefore, option B is correct.

C. Split horizon is a feature used in some routing protocols to prevent routing loops. When a router learns a route from one of its interfaces, it does not advertise that route back out of the same interface. This option is incorrect because split horizon is not unique to dual-homed connections; it can be used with both single-homed and dual-homed connections.

D. OSPF and BGP are both routing protocols used in large-scale networks. They can be used together to exchange routing information between autonomous systems. This option is incorrect because OSPF and BGP can be used together with both single-homed and dual-homed connections.

In summary, of the given options, the benefit of implementing a dual-homed WAN connection instead of a single-homed connection is that it enables an individual router to tolerate the loss of a network link (option B).

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