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Authors:
James F. Kurose, Keith W. Ross
Chapter:
The Network Layer
Exercise:
Problems
Question:37 | ISBN:9780132856201 | Edition: 6

Question

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- S routing protocol. Initially suppose there is no physical link between AS2 and AS4.

a. Router 3c learns about prefix x from which routing protocol: OSPF, RIP, eBGP, or Ibgp?

b. Router 3a learns about x from which routing protocol?

c. Router 1c learns about x from which routing protocol?

d. Router 1d learns about x from which routing protocol?


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Answer

EBGP: external BGP runs between routers in different ASs

IBGP: internal BGP runs between routers in the same AS

a. eBGP: Router 3c learns about x from eBGP

b. iBGP: Router 3a learns about x from iBGP

c. eBGP: Router 1c learns about x from eBGP

d. iBGP: Router 1d learns about x from iBGP

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