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Chapter 4 Network Layer and Routing
1) What are the two main functions of a datagram-based network layer? What additional functions does a VC-based network layer have?
2) List and describe the ATM network service models.
3) Compare and contrast link-state and distance-vector routing algorithms.
4) Discuss how a hierarchical organization of the Internet has helped to scale to millions of users.
5) It is necessary that every autonomous system use the same intra autonomous routing algorithm? Why or why not?
Section 4.5
6) What is the decimal equivalent of the IP address 223.1.3.27 ?
7) Consider a LAN to which ten host interfaces and three router interfaces are attached. Suppose all three LANs use class C addresses. The IP addresses for the 13 devices will be identical in which of the first 32 bits?
8) Consider a router with three interfaces. Suppose all three interfaces use class C addresses. Will the IP addresses of the three interfacess necessarily have the same first 8 bits?
9) Suppose there are three routers between source and destination hosts. Ignoring fragmentation, an IP segment sent from source host to destination host will travel over how many interfaces? How many routing tables will be indexed to move the datagram from source to destination?
10) Suppose an application generates chunks 40 bytes of data every 20 msec, and each chunk gets encapsulated in a TCP segment and then an IP datagram. What percentage of each datagram will be overhead and what percentage will be application data?
11) Consider sending a 3000 byte datagram into a link that has a MTU of 500 bytes. Suppose the original datagram is stamped with the identification number 422. How many fragments are generated? What are their characteristics?
12) Consider Figure 4.5-2. Starting with the original table in D, suppose that D receives from A the following advertisement: destination network next router number of hops to destination 30
C
10
1
--
1
10
--
1
....
....
1) What are the two main functions of a datagram-based network layer? What additional functions does a VC-based network layer have?
2) List and describe the ATM network service models.
3) Compare and contrast link-state and distance-vector routing algorithms.
4) Discuss how a hierarchical organization of the Internet has helped to scale to millions of users.
5) It is necessary that every autonomous system use the same intra autonomous routing algorithm? Why or why not?
Section 4.5
6) What is the decimal equivalent of the IP address 223.1.3.27 ?
7) Consider a LAN to which ten host interfaces and three router interfaces are attached. Suppose all three LANs use class C addresses. The IP addresses for the 13 devices will be identical in which of the first 32 bits?
8) Consider a router with three interfaces. Suppose all three interfaces use class C addresses. Will the IP addresses of the three interfacess necessarily have the same first 8 bits?
9) Suppose there are three routers between source and destination hosts. Ignoring fragmentation, an IP segment sent from source host to destination host will travel over how many interfaces? How many routing tables will be indexed to move the datagram from source to destination?
10) Suppose an application generates chunks 40 bytes of data every 20 msec, and each chunk gets encapsulated in a TCP segment and then an IP datagram. What percentage of each datagram will be overhead and what percentage will be application data?
11) Consider sending a 3000 byte datagram into a link that has a MTU of 500 bytes. Suppose the original datagram is stamped with the identification number 422. How many fragments are generated? What are their characteristics?
12) Consider Figure 4.5-2. Starting with the original table in D, suppose that D receives from A the following advertisement: destination network next router number of hops to destination 30
C
10
1
--
1
10
--
1
....
....