Review for Chapter 4 - Review for Chapter 4 Chapter 4...

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Review for Chapter 4
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Chapter 4 Review Questions 1,2,3,4,10,15,16,19,20,21 (13,23,24,26,33) Problems 7,10,15 (4,5,6,13,14,23,25,33,37)
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1. Let’s review some of the terminology in this textbook. Recall that the name of transport-layer packet is segment and the name of a link-layer packet is frame. What is the name of a network-layer packet? Recall that both router and link-layer switches are called switches. What is the fundamental difference between a router and link-layer switch? Recall that we use the team routers for both datagram networks and VC network.
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Review: A network-layer packet is a datagram. A router forwards a packet based on the packet's IP (layer 3) address. A link-layer switch forwards a packet based on the packet's MAC (layer 2) address.
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2 What are the two most important network- layer functions in a datagram network ? What are three most important network- layer functions in a circuit-switched network?
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Review: Datagram-based network layer: forwarding; routing. Circuit-switched network layer: call setup, forwarding, routing.
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3 What is the difference between routing and forwarding? Review Forwarding is about moving a packet from a router's input link to the appropriate output link. Routing is about determining the end-to-end route between sources and destinations
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4 Do the routers in both datagram networks and virtual-circuit networks use forwarding table? If so, describe the forwarding tables for both classes of networks.
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Review Yes, both use forwarding tables. For descriptions of the tables, see Section 4.2.
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10. Describe how packet loss can occur at input ports. Review: Packet loss can occur if the queue size at the output port grows large because of slow outgoing line-speed.
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13 What is the 32-bit binary equivalent of the IP address 223.1.3.27? Review: 11011111 00000001 00000011 00011011
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15. 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?
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Review: 8 interfaces 3 forwarding tables
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16. 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 Review: 50% for overhead and 50% for application data
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19 Compare and contrast the IPV4 and the IPV6 header fields. Do they have any fields in common
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20 It has been said that when ipv6 tunnels through ipv4 routers.IPV6 treats the IPV4 tunnels as a link-layer protocols. Do you agree with this statement? Why or why not Review Yes, because the entire IPv6 datagram (including header fields) is encapsulated in an IPv4 datagram
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21 Compare and contrast link state and distance vector routing algorithm Review: Link state algorithms: Computes the least-cost path between source and destination using complete, global knowledge about the network.
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Review for Chapter 4 - Review for Chapter 4 Chapter 4...

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