Need help with this i am confused if someone could help me 2. Consider the netwo
ID: 3914134 • Letter: N
Question
Need help with this i am confused if someone could help me
2. Consider the network shown below. Suppose AS3 and AS2 are running OSPF for their intra-AS routing protocol. Suppose AS1 and AS4 are running RIP for their intra- AS routing protocol. Suppose eBGP and iBGP are used for the inter-AS routing protocol. Initially suppose there is no physical link between AS2 and AS4. Router 3c learns about prefix x from which routing protocol: OSPF, RIP, eBGP, or iBGP? Router 3a learns about x from which routing protocol? Router 1c learns about x from which routing protocol? Router 1d learns about x from which routing protocol? a. b. c. d. Once router 1d learns about x it will put an entry (x, I) in its forwarding table. Answer the following questions, e. Will Ibe equal to I? or I2 for this entry? Explain why in one sentence f. Now suppose that there is a physical link between AS2 and AS4, shown by the dotted line. Suppose 1d leans that x is accessible via AS2 as well as AS3. Will I be set Ii or I2? Explain in one sentence Now suppose there is another AS, called AS5, which lies on the path between AS2 and AS4 (not shown in diagram). Suppose router 1d learns that x is accessible via AS2 AS5 AS4 as well as AS3 AS4. Will I be set to I? or I2? Explain why in one sentence. g.Explanation / Answer
Ans)
(a) eBGP
(b) iBGP
(c) eBGP
(d) iBGP
(e) I will be equal to I1 because this interface begins the least cost path from 1d towards the gateway router 1c.
(f) I will be set to I2 because both routes have equal AS-PATH length but I2 begins the path which has the closest NEXT-HOP router.
(g) I will be set to I1. I1 begins the path that has the shortest AS-PATH.