. BGP: route selection (10 points) Consider the following network. 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 AS4 2c 2a AS3 la AS2 td AS1 a) (1 pt) Router 4b learns about x from which routing protocol? b) (1 pt) Router 1c learns about x from which routing protocol? c) (1 pt) Router 1d learns about x from which routing protocol? d) (2 pt) Once router 1d learns about prefix x it will put an entry (x. I) in its forwarding table. Will I be equal to h or I2 for this entry? Explain. e) 3 pt) Now suppose that there is a physical link between AS2 and AS4, shown by the dotted line. Suppose router 1d learns that x is accessible via AS2 as well as via AS3. Will I be equal to l or 12? Explain. (2 pt) Now suppose there is another AS, called AS5, which lies on the path between AS2 and AS4 (not shown in the figure above). Suppose router 1d learns that x is accessible via AS2-AS5-AS4 as well as via AS3-AS4. Will I be equal to or l2? Explain. f)