tutorial8 - bytes. Suppose the original datagram is stamped...

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EE3015 Tutorial 8 (IP address, IP fragmentation, NAT) Review Questions y Do routers have IP addresses? If so, how many? y What is the difference between routing and forwarding? y What is the 32-bit binary equivalent of the IP address 223.1.3.27? Problems: 1. Consider a router that interconnects three subnets: Subnet 1, Subnet 2, and Subnet 3. Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. Also suppose that Subnet 1 is required to support up to 125 interfaces, and Subnets 2 and 3 are each required to support up to 60 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints. 2. Consider sending a 3,000-byte datagram into a link that has an MTU of 500
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Unformatted text preview: bytes. Suppose the original datagram is stamped with the identification number 422. How many fragments are generated? What are the sizes of the fragments and what are the values in their header fields? 3. Suppose a peer with user name A discovers through querying that a peer with user name B has a file its wants to download. Also suppose that B is behind a NAT whereas A is not. Let 138.76.29.7 be the WAN-side address of the NAT and let 10.0.0.1 be the internal IP address for B. Assume that NAT is not specifically configured for the P2P application. Discuss why A’s peer cannot initiate a connection to B’s peer, even if A knows the WAN-side address of the NAT, 138.76.29.7....
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This note was uploaded on 05/01/2011 for the course ELECTRICAL EE3015 taught by Professor Albertsun during the Spring '11 term at City University of Hong Kong.

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