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Problem 1 Consider a network of 6 routers shown in the gure below. The network is running OSPF routing protocol and the cost of each link is 10. Each router is announcing a single unique pre x, in total 6 pre xes are announced (pre x A, pre x B, … pre x F).…
Problem 1
Consider a network of 6 routers shown in the gure below. The network is running OSPF routing protocol and the cost of each link is 10. Each router is announcing a single unique pre x, in total 6 pre xes are announced (pre x A, pre x B, … pre x F). Propagation delay for each link is 10msec. When a router has to choose between two or more equal cost paths to the same destination, it breaks the tie by picking the path whose next hop has smallest name (A < B < C < D < E < F). The network has been up and running for a long time. However, at time T=100 min, link A-F fails.
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Problem 2
Consider the network shown below. Suppose all ASes (AS 1 { AS 4) are running OSPF for their intra-AS routing protocol. Suppose BGP is used for the inter-AS routing protocol (and iBGP is used inside each AS).
At some time T, the pre x x appears in AS4, adjacent to the router 4a. From which routing protocol (OSPF, eBGP, or iBGP):
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Problem 3
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Problem #4
Suppose four active nodesnodes A, B, C and Dare competing for access to a channel using slotted ALOHA. Assume each node has an in nite number of packets to send. Each node attempts to transmit in each slot with probability p. The rst slot is numbered slot 1, the second slot is numbered slot 2, and so on.
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Problem 5
Consider the following network topology with speci ed MAC addresses for network interfaces and the con-gured IP addresses:
00-00-00-00-00-05
192.168.1.253
Node C
00-00-00-00-00-02
192.168.0.2 | |||||||||||||||
00-00-00-00-00-01 | |||||||||||||||
Node A | 2 | 192.168.0.1 | |||||||||||||
192.168.1.254 | |||||||||||||||
Switch 1 | |||||||||||||||
Router 00-00-00-00-00-04 | |||||||||||||||
3 | |||||||||||||||
00-00-00-00-00-03 | |||||||||||||||
192.168.0.3 | |||||||||||||||
Node B
Assume the network mask for both subnetworks is 255.255.255.0.
frame # | dst MAC addr | src MAC addr | device(s) that can get the frame, | new entries added into | ||
excluding the sender | the switch’s table (if any) | |||||
frame # | dst MAC addr | src MAC addr | device(s) that can get the frame, | new entries added into | ||
excluding the sender | the switch’s table (if any) | |||||