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Which of the following will allow the company to continue to maintain an Internet presence at all sites in the

A company wants to create highly available datacenters. Which of the following will allow the
company to continue to maintain an Internet presence at all sites in the event that a WAN circuit at
one site goes down?

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A.
Load balancer

B.
VRRP

C.
OSPF

D.
BGP

Explanation:

10 Comments on “Which of the following will allow the company to continue to maintain an Internet presence at all sites in the”

  3. Bob says:

    I believe it’s BGP because BGP deals with routing from autonomous systems. Essentially, BGP is correct as it’s the protocol used for a virtual gateway service. This way, you send to the virtual gateway, the virtual gateway connects to two physical gateways. So if one gateway goes down, the virtual gateway will default to the other one. And you can have multiple virtual gateways that all utilize the same two physical gateways. So the answer is indeed D. BGP.




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    1. net says:

      it is not D. BGP = Border Gateway Protocol and deals with exterior routers outisde your LAN. THe answer should be B. Virtual Router Redundancy Protocol sets a virtual router as your gateway so if it fails your physical one kicks in.




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      1. DVS says:

        The question is quite vague, but I think the answer is D and here’s why.

        The key words here are internet presence, most ISP cloud are exactly equipped with router redundancy because they operate at layer 2 (Packet switching and MPLS.) So router redundancy wouldn’t work as they operate at different layer, yes it would allow the default gateway to exist but that wouldn’t guarantee an internet presence especially for all the site. A WAN circuit is controlled by the ISP, and the ISP would most likely be running PAT with a single connection to the border device on the ISP cloud. So that means VRRP wouldn’t work, unless there were two physical connection to the designated ISP. Let say that VRRP was used and both physical links connected to a middle device and then that middle device connected to the border ISP, if the WAN link between the middle device and ISP fails – then VRRP would still work but internet presence would stop. So VRRP doesn’t guarantee internet presence, just provide a fallback on layer 2 level.

        BGP is the protocol used by the internet, the best thing about the internet is that if one path to a node fails, BGP re-routes the via another path. There are vitually multiple redundancy placed thanks to BGP. If any WAN circuit, that is any link that has a public IP address goes down BGP will find another way to that address.

        That why I think the answer is D.

        – Happy Hunting




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  4. Josh says:

    Wouldn’t the answer be load balancer? If the load balancer at one site sense that one of the sites are down or something like that, wouldn’t it distribute the load equally?




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  5. Hello says:

    The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol that provides for automatic assignment of available Internet Protocol (IP) routers to participating hosts. This increases the availability and reliability of routing paths via automatic default gateway selections on an IP subnetwork.




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