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Chapter 5 Network and Transport Layers True-False Questions The following are possible True/False questions for tests. The statement is given and the answer is provided . The level of difficulty (easy, moderate, difficult) and the page number(s) relevant to the topic are also furnished. 1. 2. 3. 4. Several different protocols exist that specify how network and/or transport layer packets are organized. Answer: True Difficulty: Easy TCP/IP is a data link protocol that is used on the Internet. Reference: p.144 Answer: False Difficulty: Moderate Reference: p. 144 The network layer sits between the application layer and the data link layer in the Internet five-layer network model. Answer: False Difficulty: Easy Reference: p. 144 The network layer is responsible for end-to-end delivery of the message. 5. Answer: False Difficulty: Easy Reference: p. 144 The transport layer routes messages thought the network selecting the best path from the source to the destination station. 6. Answer: False Difficulty: Easy Reference: p. 144 The network layer depends upon the data link layer for error-free delivery of messages from one computer to the next. 7. Answer: True Difficulty: Easy Reference: p. 144 The transport layer process running on the destination computer, reassembles the fragmented application message before passing it up to the application layer 8. Answer: True Difficulty: Moderate Reference: p. 144-145 Software with multiprotocol stacks refers to the fact that the software supports several different transport/network protocols. 9. Answer: True Difficulty: Easy Reference: p. 145 Some network protocols, such as TCP/IP, are compatible with a variety of different data link layer protocols, such as Ethernet or frame relay. Answer: True Difficulty: Easy Reference: p. 146 10. TCP is the network layer protocol used on the Internet today. 11. Answer: False Difficulty: Easy Reference: p. 146 IP is responsible for error-free delivery of packets on a TCP/IP network. Answer: False Difficulty: Easy Reference: p. 146 12. The TCP portion of TCP/IP performs a data presentation/formatting function. 13. Answer: False Difficulty: Easy Reference: p. 146 The source port identifier in the TCP header tells the TCP software on the destination computer, which application on the destination it should pass the packet too. 14. Answer: False Difficulty: Easy Reference: p. 147 TCP includes a sequence number so that the packets can be reassembled at the destination in the correct order. 15. Answer: True Difficulty: Moderate Reference: p. 147 The latest version of IP is IPv7, which increases the address space from 128 bits to 256 bits. 16. Answer: False Difficulty: Easy Reference: p. 147 IPX/SPX is the primary network protocol uses by Microsoft networks. 17. 18. 19. 20. 21. 22. 23. 24. Answer: False Difficulty: Easy Reference: p 148 IPX is the transport layer process and is responsible for the error-free delivery of data on an IPX/SPX network. Answer: False Difficulty: Moderate X.25 is primarily used in local area networks Reference: p. 148 Answer: False Reference: p.148 Difficulty: Moderate To help determine to which application a transmission should be delivered on a particular computer, TCP uses the application layer port addresses to distinguish among many open applications on a computer Answer: True Difficulty: Moderate Reference: p. 149 Source port address is the logical address generated by the application layer on the source computer to identify the application, which is sending the data. Answer: True Difficulty: Easy The standard port number for Telnet is 53. Reference: p 149 Answer: True Difficulty: Easy Reference: p 150 Because there is a limit on the length of a frame that the data link layer can transmit from node to node, the transport layer breaks up the message from the application layer into several smaller packets. Answer: True Difficulty: Moderate Reference: p. 150 Connectionless routing sets up a TCP connection, or virtual circuit between a sender and receiver. Answer: False Difficulty: Moderate TCP/IP operates only as connection-oriented. Answer: False Difficulty: Moderate Reference: p. 152 Reference: p. 152 25. Quality of Service routing is a special type of connection-oriented routing in which different connections are assigned different priorities. 26. Answer: True Difficulty: Easy An example of an application layer address is www.indiana.edu 27. Answer: True Difficulty: Easy The network layer address for IP is ten bytes long when using IPv4. 28. 29. Reference: p. 153 Reference:p.153 Answer: False Difficulty: Easy Reference: p. 153 The data link layer address is generally encoded in a network card by the card’s manufacturer. Answer: True Difficulty: Easy Reference: p. 154 IPv4 addresses offer unlimited opportunity for expansion and growth on the Internet. 30. Answer: False Difficulty: Easy Reference: p. 155 Subnet masks tell computers what part of an IP address is to be used to determine whether a destination is in the same subnet or in a different subnet. 31. Answer: True Difficulty: Moderate Reference: p. 156 Two standards for dynamic addressing for TCP/IP networks are: Bootstrap Protocol and Dynamic Host Control Protocol. 32. Answer: True Difficulty: Easy Reference: p. 157 Translating an application layer address to a network layer address and finally to a data link layer address is called address resolution. 33. Answer: True Difficulty: Easy Reference: p.158 Part of the function of address resolution is translating the application layer address of the destination into a network layer address. 34. Answer: False Difficulty: Easy Reference: p. 158 Domain Name Servers provide the equivalent of directory assistance for application layer addresses. 35. Answer: True Difficulty: Easy Reference: p. 158 An Address Resolution Protocol message is broadcast to all computers in a subnet to find the data link layer address. 36. Answer: True Difficulty: Moderate Reference: p. 159-160 Routing is the process of determining the path or route through the network that a particular message will follow from the sender to the recipient 37. Answer: True Difficulty: Easy Reference: p.161 There are four fundamental approaches to routing: centralized, static routing, dynamic routing, and monitor routing. Answer: False Difficulty: Moderate Reference: p. 164 38. When using dynamic routing, routing decisions are always made by a central host or server. 39. Answer: True Difficulty: Easy A hop in a routing calculation is defined as one link or circuit. 40. Answer: True Difficulty: Easy An autonomous system is a network operated by one organization. 41. Answer: False Difficulty: Easy Reference: 165 A routing protocol used inside an autonomous system is called an exterior routing protocol. 42. 43. Reference: p. 164 Reference: p. 164-165 Answer: False Difficulty: Easy Reference: 165 Enhanced Interior Gateway Routing Protocol is a dynamic link state interior routing protocol developed by Cisco. Answer: True Difficulty: Moderate Reference: 165 A multicast message can be used to send a message to a maximum of two other computers. Answer: True Difficulty: Moderate Reference: 168 MULTIPLE CHOICE The following are possible multiple-choice questions for tests. The question is posed and the answer is provided under the choices. The level of difficulty (easy, moderate, difficult) and the page number(s) relevant to the topic is also furnished. 1. 2. The ____________ layer links the application layer with the network layer is responsible for end-to-end delivery of messages. a. physical b. transport c. session d. presentation e. data link Answer: B Difficulty: Easy Reference: p. 144 On the destination station, the ________ layer is responsible for providing error-free messages to the ________ layer. a. network, data link b. application, transport c. data link, network d. physical, data link e. transport, application Answer: B Difficulty: Moderate Reference: p. 144 3. 4. 5. 6. 7. 8. __________ is not an important function of the transport layer. a. end-to-end delivery of the message b. taking messages from the application layer c. routing d. breaking long messages into smaller packets e. interfacing with the network layer Answer: C Difficulty: Moderate Reference: p. 144 Network _______ are important to ensure that hardware and software from different vendors operated by different companies can communicate. a. protocols b. directories c. frequencies d. topologies e. directions Answer: A Difficulty: Easy _______ is the dominant network protocol today. a. SDLC b. SNA c. IPX/SPX d. TCP/IP e. X.25 Reference: p.145-146 Answer: D Difficulty: Easy Reference: p. 146 Transmission Control Protocol/Internet Protocol was developed for ________ in 1974. a. ARPANET b. IBM c. Hewlett-Packard d. University of Minnesota e. Xerox Answer: A Difficulty: Easy Reference: p. 146 TCP/IP: a. is the least commonly used network protocol for LANs because it cannot be combined with Ethernet b. performs packetizing, as well as routing and addressing functions c. is not very efficient and is prone to errors d. is compatible with only one type of data link protocol, SDLC e. refers to Telephone Control Procedures/Inter-exchange Procedures Answer: B Difficulty: Moderate Reference: 146 A typical TCP packet has a _______ header of control information. a. 32-bit b. 64-bit c. 160-bit d. 192-bit e. 32-byte Answer: D Difficulty: Easy Reference: p. 146 9. 10. 11. 12. 13. 14. The source destination port identifier tells the destination station _____________. a. which computer sent the TCP packet. b. which application layer program that the packet should be sent c. which application layer process the packet is from. d. the IP address of the source computer. e. the IP address of the destination computer. Answer: C Difficulty: Moderate Reference: p.146-147 TCP uses _____________ so that the destination station can reassemble the packets into the correct order. a. IP addresses b. sequence numbers c. port numbers d. packet numbers e. reassembly value Answer: B Difficulty: Moderate Reference: p. 147 The older version of IP has a ________ header of control information. a. 128-bit b. 192-bit c. 1024-bit d. 160-bit e. 320-bit Answer: B Difficulty: Easy IP: a. performs packetizing functions b. does not have a header c. is currently in use with only one packet form or structure d. performs routing functions e. performs error control functions Reference: p. 147 Answer: D Difficulty: Moderate Reference: p. 147 The newer form of IP, version 6 (Ipv6) is: a. running out of address space to support the growth of the Internet b. has a 20 byte header c. has an increased address size from 32 bits to 128 bits d. does not include version number in its header e. does not include hop limit in its header Answer: C Difficulty: Moderate Reference: p. 147 IPX/SPX: a. refers to Intermodulation Protocol Exchange/Serial Protocol Exchange b. is the primary network protocol used by Microsoft NT networks c. is based on a routing protocol developed by IBM in the 1990s d. is not similar to TCP/IP in function can not be used with Ethernet e. performs packetizing, as well as addressing and routing functions Answer: E Difficulty: Moderate Reference: p. 148 15. 16. In the IPX/SPX network model, ______is the network layer protocol and performs the same routing and addressing functions as its counterpart IP in the TCP/IP model. a. IPX b. SPX c. SAP d. NCP e. UDP Answer: A Difficulty: Moderate Reference: p. 148 X.25: a. does not perform routing functions b. is a network standard used in wide area networks c. is extensively used in North America by domestic (non-international) companies d. is relatively new, therefore it is not used by many organizations e. has one part that handles addressing and packetizing Answer: B 17. 18. 19. Difficulty: Moderate Reference: p. 148 Assume that more than one application programs that are using the same communications line on a particular computer. To be able to decide to which application program a message should be delivered on this computer, TCP/IP relies on the: a. data link layer address b. port address c. application layer address d. network address e. IP address Answer: B Difficulty: Moderate Reference: p. 149 The transport layer must break messages from the application layer into several _____ that can be sent to the data link layer. a. bits b. bytes c. frames d. packets e. strings Answer: D Difficulty: Easy Reference: p. 150 The negotiation by the transport layer at the sender with the transport layer at the receiver to determine what size packets should be set up is done via establishing a(n) ___________ between the sender and receiver. a. network layer address resolution b. one way handshake c. SNA message d. TCP connection e. DNS server request Answer: D Difficulty: Moderate Reference: p.150 20. 21. 22. 23. 24. A virtual circuit is established in the ___________ routing method. a. asynchronous b. connection-oriented c. frequency division d. application net e. connectionless Answer: B Difficulty: Moderate Reference: p.152 A special packet called a(n) _____________ packet is sent to the receiver requesting the establishment of a connection a. ACK b. NAK c. SYN d. ARQ e. FIN Answer: C Difficulty: Moderate Reference: p.152 _____________ routing is a method of routing in which each packet makes its own way through the network. a. Frequency division b. Connection-oriented c. PCMCIA d. Connectionless e. Application net Answer: D Difficulty: Moderate Reference: p. 152 In connection-oriented routing, the _________ layer sets up a virtual circuit between the sender and the receiver. a. transport b. network c. physical d. data link e. connection Answer: A Difficulty: Moderate Which of the following is not a protocol used at the application layer. a. HTTP b. SMTP c. FTP d. Telnet e. UDP Answer: E Difficulty: Moderate Reference: p. 152 Reference: 152 25. 26. 27. 28. 29. ______________ routing is most commonly used when the application data or message can fit into one single packet. a. Frame-oriented b. Connection-oriented c. Connectionless d. Physical-oriented e. Byte-oriented Answer: C Difficulty: Moderate UDP is not commonly used for: a. network management control messages b. RIP messages c. DHCP addressing messages d. HTTP requests e. routing control messages Reference: p. 152 Answer: D Difficulty: Moderate Reference: 152 With QoS routing different __________ are defined, each with different priorities. a. classes of service b. domain names c. application layer addresses d. data link layer addresses e. classes of Internet addresses Answer: A Difficulty: Easy An application layer address using TCP/Ipv4 looks like: a. 128.192.78.5 b. www.cba.uga.edu c. [email protected] d. 00-0F-00-81-14-00 e. Building 4, Room 2, User 3 Reference: 153 Answer: B Difficulty: Moderate Reference: p.153 A client computer is assigned a data link layer address is by: a. hardware manufacturers b. software manufacturers c. middleware manufacturers d. network managers who configure a file in a computer’s network layer software package e. ISO Answer: A Difficulty: Moderate Reference: p. 154 30. 31. 32. 33. 34. ICANN: a. developed the IPX/SPX network layer protocol b. assigns data link layer addresses c. approves which network layer addresses (usually, approved or assigned in groups or classes) can be used by an organization for its computers that will connect to the Internet d. developed X.25 network layer protocol e. refers to Interchange Computer Addressing Networks and Nodes Answer: C Difficulty: Moderate IPv6 will be based upon _________ -byte addresses. a. 32 b. 24 c. 4 d. 16 e. 8 Reference: p. 155 Answer: D Difficulty: Moderate IPv4 uses ________ bytes per Internet address. a. 4 b. 32 c. 8 d. 24 e. 16 Reference: p. 155 Answer: A Difficulty: Easy Reference: p. 155 A(n) ________ refers to a group of computers that are logically grouped together by IP number. a. IPv6 group b. subnet c. data link group d. TCP group e. application net Answer: B Difficulty: Moderate Reference: p. 155-156 A subnet mask of ___________ means that all computers with only the same first two bytes in their IPv4 addresses are on the same subnet. a. 11111111.0.0.0 b. 255.255.255.0 c. 255.0.0.0 d. 255.255.0.0 e. 255.255.255.255 Answer: D Difficulty: Moderate Reference: p.156 35. 36. 37. 38. 39. Dynamic addressing: a. assigns a permanent network layer address to a client computer in a network b. makes network management more complicated in dial-up networks c. has only one standard, bootp d. is always performed for servers only e. can solve many updating headaches for network managers who have large, growing, changing networks Answer: E Difficulty: Easy Reference: p. 157 ___________ is the translation of application layer addresses into IP addresses. a. Network interface card reversal b. IPv6 c. Server name resolution d. Subnet masking e. Name service coding Answer: C Difficulty: Easy Server name resolution is done using the: a. Address Resolution Protocol b. Border Gateway Protocol c. Internet Control Message Protocol d. Routing Information Protocol e. Domain Name Service Reference: p. 158 Answer: D Difficulty: Moderate Reference: p. 158 When TCP/IP translates an application layer address into an IP address, it sends a special __________ to the nearest DNS server. a. broadcast message b. DNS request packet c. SNA packet d. IPX message e. X.25 packet Answer: B Difficulty: Moderate Reference: 159 When TCP/IP translates a network layer address into a data link layer address, it sends a special ____________ to all computers in the subnet. a. physical layer packet b. multicast message c. X.25 message d. broadcast message e. application layer packet Answer: D Difficulty: Easy Reference: 159 40. 41. 42. 43. 44. _________ is a specially formatted request used to perform IP address to data link address resolution. a. Address Resolution Protocol b. Domain Service Request c. HTTP request d. Link state request e. Autonomous System Request Answer: A Difficulty: Moderate Reference: 160 ___________ is the process of determining the path that a message will travel from sending computer to receiving computer. a. Routing b. Addressing c. Interfacing d. Broadcasting e. Packetizing Answer: A Difficulty: Moderate Reference: p. 161 The _____________ is used by a computer to determine how messages will travel through the network. a. routing table b. configuration listing c. linking loader d. bus header assignment list e. file allocation table Answer: A Difficulty: Moderate Reference: p.161 In its simplest form, the __________ has two columns: the first column lists every computer and device in the network, while the second column lists the computer or device to which that computer should send messages, if they are destined for the computer in the first column. a. linking loader b. routing table c. configuration listing d. bus header assignment list e. file allocation table Answer: B Difficulty: Moderate The three fundamental approaches to routing are: a. circuitous, flat, and direct routing b. connectionless, static, and connection-oriented c. subordinate, master, and insubordinate routing d. host, client, and client-server routing e. centralized, static routing, and dynamic routing Answer: E Difficulty: Moderate Reference: p.161 Reference: p.164 45. 46. 47. 48. 49. An advantage of centralized routing is: a. routing does reflect changing network conditions, such as computers that are overloaded by many messages b. if anything happens to the computer developing the routing table, the routing tables cannot be changed until that computer is fixed, or until a new computer is selected to perform the function c. routing decisions are simple d. the routing tables are stored at all computers in the network e. it requires more processing by each computer or router in the network than dynamic routing Answer: C Difficulty: Moderate Reference: p.164 With ________ routing, computers or routers count the number of hops along a route and periodically exchange information on the hop count with their neighbors. a. circuitous b. decentralized c. distance vector d. indirect e. link state Answer: C Difficulty: Moderate Reference: p.164 ____________ refers to the type of routing in which the routing table is developed by the network manager and modifications are made only when computers are added to or removed from the network. a. Adaptive routing b. Dynamic routing c. Static routing d. Distance vector routing e. Link state routing Answer: C Difficulty: Moderate _______________ is a type of dynamic routing. a. Static routing b. Circuitous routing c. Centralized routing d. Link state e. X.25 routing Reference: p.164 Answer: D Difficulty: Easy Reference: p. 164-165 One drawback to dynamic routing is: a. Routing usually does not reflect changing network conditions, such as computers that are overloaded by many messages b. It cannot be used with non-government networks c. The transmission of status information “wastes” network capacity that could be used to send user messages d. It is the job of the network manager, not the computers or devices themselves, to maintain the routing table. e. It requires less processing by each computer than static routing. Answer: C Difficulty: Moderate Reference: p.165 50. 51. 52. 53. 54. The ping command uses the most basic interior routing protocol on the Internet, which is the: a. Border Gateway Protocol b. Internet Control Message Protocol c. Routing Information Protocol d. Enhanced Interior Gateway Routing Protocol e. Open Shortest Path First Answer: B Difficulty: Moderate Reference: p. 166-167 A type of message that is used when sending a message from one computer to another computer is called a: a. unicast message b. multicast message c. broadcast message d. guided message e. radiated message Answer: A Difficulty: Easy Reference: p.168 A special type of message that is used when sending the same message to a specific group of computers is called a: a. unicast message b. multicast message c. broadcast message d. guided message e. radiated message Answer: B Difficulty: Easy Reference: p.168-169 A special type of message that is used when sending the same message to all computers on a specific LAN or subnet is called a: a. unicast message b. multicast message c. broadcast message d. guided message e. radiated message Answer: C Difficulty: Easy IGMP refers to: a. Internet Giga Memory Parameters b. Interchange Group Management Parameters c. Internet Guided Meta Protocol d. Internet Group Management Protocol e. Interchange Guided Meta Protocol Answer: D Difficulty: Easy Reference: p.168-169 Reference: p.169 55. Which of the following is not given to a client computer that is installed on a TCP/IP network so that it has the appropriate routing/addressing information? a. application layer address b. subnet mask c. its own IP address d. IP address of its DNS server e. IP address of a gateway, router, or a switch outside of its subnet Answer: A Difficulty: Moderate Reference: p.169 Short Answer and Essay Questions 1. What does the network layer do? Where does it sit in relationship to the other four layers of our simplified network model? 2. What are the parts of TCP/IP and what do they do? Who is the primary user of TCP/IP? 3. What are the parts of X.25 and what do they do? Who is the primary user of X.25? 4. Compare and contrast the three types of addresses used in a network. 5. What are the different classes of Internet addresses and how are they different? 6. What is a subnet and why do networks need them? What is a subnet mask? 7. How does dynamic addressing work? What benefits and problems does dynamic addressing provide? 8. What is address resolution? How does TCP/IP perform address resolution for network layer addresses? How does TCP/IP perform address resolution for data link layer addresses? 9. What is routing? How does decentralized routing differ from centralized routing? How does static routing differ from dynamic routing? When would you use static routing? When would you use dynamic routing? How does static routing differ from dynamic routing? When would you use static routing? When would you use dynamic routing? 10. What are the differences between connectionless and connection-oriented routing? Discuss this in detail and also do a schematic of this. When might UDP be used? TCP? What is a virtual circuit? What is Quality of Service routing and why is it useful? 11. Compare and contrast unicast, broadcast, and multicast messages. Explain how multicasting works. 12. Explain how the client computer in the LAN figure in the book would obtain the data link layer address of its subnet gateway. 13. Explain how TCP/IP works in a high level way, using a detailed diagram including the different roles of TCP vs. IP, and the times at which each function is utilized in the process. 14. List and describe five reasons why TCP/IP has become the predominant protocol for Internet level transport applications. What do you think is the future market share potential for proprietary standards? What are some limitations of TCP/IP in terms of future Internet growth capabilities? 15. What is a routing table? What is the simplest form of a routing table? 16. What is a virtual circuit? 17. Suppose a client computer wants to access a web page on a web server. Assume that it knows all of the IP addresses and data link layer addresses in the network, except those for the web server itself. Describe how the client would obtain the IP address for the web server. 1. Suppose a client computer wants to access a web page on a web server. Assume that it knows all of the IP addresses and data link layer addresses in the network, except those for the web server itself. If the web server was on the same subnet as the client, how would the client obtain the data link layer address for the web server? 2. Under what conditions does decentralized dynamic routing provide better performance than decentralized static routing? 3. What is DHCP and why would network managers want to use it? 4. Explain how multicasting works. 5. What four pieces of information does a computer using TCP/IP need in order to send messages using TCP/IP. Explain why each of these is required. 6. Suppose your manager asks you to discuss how the company’s backbone network functions in just about four paragraphs to take to senior management. How would you answer the question? Discuss two or three major points. Your manager doesn't understand technical terms so be sure to explain any jargon you use. 7. What is the difference between centralized routing and decentralized routing? What is the difference between static routing and dynamic routing? What is a distance vector algorithm and what is a link state algorithm? What is interior routing and what is exterior routing? Define and describe RIP, OSPF, EIGRP, BGP protocols using these terms. Draw a schematic diagram of routing on the internet with BGP, OSPF, and RIP. 8. Draw an example of a NAT, including an example of a “realm” with fake IP addresses, and include the WAN and LAN side source and destination IP’s and ports in your example. Discuss NAT. What is its purpose? How does the router know what to do with incoming packets? What does a NAT enabled router look like to the outside world? What does NAT have to do with IPv6? 9. Be able to convert back and forth between binary and decimal notation for IP addresses, v4. 10. Draw a schematic of the Domain Name Server process and describe how this system works and is hierarchically organized. What happens if a URL is not in a local DNS server? 11. What is ARP and how and why does it work? What is MAC address resolution and how does it work?