Question

4. (10 points) BGP: AS relationship a) (5 pts) Consider the AS topology shown below. AS1, AS2 and AS3 are access ISPs. AS4 and AS5 are regional ISPs and AS6 is a Tier 1 ISP. What path does a packet from host X to Y take? Recall the policies that AS's adopt when routing packets. If there is a tie, assume that every AS prefers paths with smaller number of hops. Customer--Provider links Peering links AS6 AS4 AS5 AS1 AS2 AS3 X Y b) (5 pts) Consider the network below in which network W is a customer of ISP A, network Y is a customer of ISP B, and network X is a customer of both ISPs A and C. Which BGP routes will A advertise to C? W A B Y C X

          4. (10 points) BGP: AS relationship
a) (5 pts) Consider the AS topology shown below. AS1, AS2 and AS3 are access
ISPs. AS4 and AS5 are regional ISPs and AS6 is a Tier 1 ISP. What path does a
packet from host X to Y take? Recall the policies that AS's adopt when routing
packets. If there is a tie, assume that every AS prefers paths with smaller number
of hops.
Customer--Provider
links
Peering links
AS6
AS4
AS5
AS1
AS2
AS3
X
Y
b) (5 pts) Consider the network below in which network W is a customer of ISP A,
network Y is a customer of ISP B, and network X is a customer of both ISPs A
and C. Which BGP routes will A advertise to C?
W
A
B
Y
C
X

4. (10 points) BGP: AS relationship
a) (5 pts) Consider the AS topology shown below. AS1, AS2 and AS3 are access
ISPs. AS4 and AS5 are regional ISPs and AS6 is a Tier 1 ISP. What path does a
packet from host X to Y take? Recall the policies that AS's adopt when routing
packets. If there is a tie, assume that every AS prefers paths with smaller number
of hops.
Customer–Provider
links
Peering links
AS6
AS4
AS5
AS1
AS2
AS3
X
Y
b) (5 pts) Consider the network below in which network W is a customer of ISP A,
network Y is a customer of ISP B, and network X is a customer of both ISPs A
and C. Which BGP routes will A advertise to C?
W
A
B
Y
C
X

Added by Meghan M.

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