The text shows how transport segments fit into internet packets which fit into link layer frames.

computer science


Questions - Chapter One (Core Network Concepts and Terminology).

Text: Panko, Raymond R; Panko, Julia L.  Business Data Networks and Security, Eleventh Edition.  Pearson Education Inc., New York, NY.  2019.  ISBN: 978-0-13-481712-5


1) The text shows how transport segments fit into internet packets which fit into link layer frames.   The Ethernet standard for example adds a frame header and a frame trailer (see pg. 30).  However, there is a physical layer beneath the data link layer and different standards exist for different media.   These include copper wire or optical fiber as shown in Figure 1-21 (pg. 27).   Do different physical standards require additional headers and/or trailers to be placed around a data link frame header or trailer?   Explain your answer.


2) For the Domain Name System (DNS), what would happen if a malevolent system acted as a DNS server and returned the IP address of a target system whenever the address of a popular system (e.g. Facebook or the FIT web site) is requested?



3) Assume you are operating within a single network (a "local area network" or "LAN").   Is it possible to exchange information between hosts without using internet "packets" and transport "segments"?   Explain your answer.



4) It is noted (pg. 22) that the transport processes address packet sequencing (ordering packets should they arrive out of order).   Could this function be handled by the internet processes instead?   Why or why not?



5) Is it possible for the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP) to operate with a different internet protocol than IP?   If so, what would be required?  Why might one do this?   Hint:  Consider the protocol stack.



6) Messages can be divided into three types based on the intended number of recipients: a unicast (single source to single known destination), a multicast (single source to multiple known destinations), and a broadcast (single source to all destinations, known or unknown).  Why is a broadcast employed when a client sends a dynamic host configuration protocol (DHCP) request message?

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