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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.

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TCP/IP is a data link protocol that is used on the Internet. Answer: False Difficulty: Moderate Reference: Transport and Network Layer Protocols The network layer sits directly between the application layer and the data link layer in the Internet five-layer network model. Answer: False Difficulty: Easy Reference: Introduction The network layer is responsible for end-to-end delivery of the message. Answer: False Difficulty: Easy Reference: Introduction The transport layer routes messages thought the network selecting the best path from the source to the destination station. Answer: False Difficulty: Easy Reference: Introduction The transport layer process running on the destination computer, reassembles the fragmented application message before passing it up to the application layer Answer: True Difficulty: Moderate Reference: Introduction

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TCP is the network layer protocol used on the Internet today.

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Answer: False Difficulty: Easy Reference: Transmission Control Protocol IP is responsible for error-free delivery of packets on a TCP/IP network. Answer: False Difficulty: Easy Reference: Internet Protocol

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The TCP portion of TCP/IP performs linking to the application layer. Answer: True Difficulty: Easy Reference: Transmission Control Protocol

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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 to. Answer: False Difficulty: Easy Reference: Linking to the Application Layer TCP includes a sequence number so that the packets can be reassembled at the destination in the correct order. Answer: True Difficulty: Moderate Reference: Transmission Control Protocol The latest version of IP is IPv7, which increases the address space from 128 bits to 256 bits. Answer: False Difficulty: Easy Reference: Internet Protocol 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: Linking to the Application Layer 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 Reference: Linking to the Application Layer The standard port number for Telnet is 53. Answer: False Difficulty: Easy Reference: Linking to the Application Layer 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: Segmenting

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Connectionless routing sets up a TCP connection, or virtual circuit between a sender and receiver. Answer: False Difficulty: Moderate Reference: Connectionless Messaging TCP/IP operates only as connection-oriented. Answer: False Difficulty: Moderate Reference: Connectionless Messaging Quality of Service routing is a special type of connection-oriented routing in which different connections are assigned different priorities.

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Answer: True Difficulty: Easy Reference: Quality of Service An example of an application layer address is www.indiana.edu

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Answer: True Difficulty: Easy Reference: Addressing The network layer address for IP is ten bytes long when using IPv4.

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Answer: False Difficulty: Easy Reference: Addressing The data link layer address is generally encoded in a network card by the card’s manufacturer. Answer: True Difficulty: Easy Reference: Assigning Addresses IPv4 addresses offer unlimited opportunity for expansion and growth on the Internet. Answer: False Difficulty: Easy Reference: Assigning Addresses 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. Answer: True Difficulty: Moderate Reference: Subnets The most common standard for dynamic addressing for TCP/IP networks is Dynamic Host Control Protocol. Answer: True Difficulty: Easy Reference: Dynamic Addressing

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Translating an application layer address to a network layer address and finally to a data link layer address is called address resolution. Answer: True Difficulty: Easy Reference: Address Resolution Part of the function of address resolution is translating the application layer address of the destination into a network layer address. Answer: True Difficulty: Easy Reference: Address Resolution Domain Name Servers provide the equivalent of directory assistance for application layer addresses. Answer: True Difficulty: Easy Reference: Server Name Resolution An Address Resolution Protocol message is broadcast to all computers in a subnet to find the data link layer address. Answer: True Difficulty: Moderate Reference: Data Link Layer Address Resolution 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. Answer: True Difficulty: Easy Reference: Routing There are four fundamental approaches to routing: centralized, static routing, dynamic routing, and monitor routing.

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Answer: False Difficulty: Moderate Reference: Types of Routing When using dynamic routing, routing decisions are always made by a central host or server.

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Answer: False Difficulty: Easy Reference: Dynamic Routing A hop in a routing calculation is defined as one link or circuit.

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Answer: True Difficulty: Easy Reference: Dynamic Routing An autonomous system is a network operated by one organization. Answer: True Difficulty: Easy Reference: Routing Protocols

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A routing protocol used inside an autonomous system is called an exterior routing protocol. Answer: False Difficulty: Easy Reference: Routing Protocols Enhanced Interior Gateway Routing Protocol is a dynamic link state interior routing protocol developed by Cisco. Answer: True Difficulty: Moderate Reference: Routing Protocols A multicast message can be used to send a message to a maximum of two other computers. Answer: False Difficulty: Moderate Reference: Multicasting

37. The shortage of IPv4 addresses has been quick, especially with the help of NAT.

Answer: False Difficulty: Moderate Reference: Management Focus 5.1 38. Connections on a router, to the Internet and other routers for example, are called applications. Answer: False Difficulty: Easy Reference: Routing

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 are also furnished.

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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: Introduction

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__________ 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: Introduction _______ is the dominant network protocol today. a. SDLC b. SNA c. IPX/SPX d. TCP/IP e. X.25 Answer: D Difficulty: Easy Reference: Transport and Network Layer Protocols 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: Transport and Network Layer Protocols 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: Transmission Control Protocol & Internet Protocol 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: Transmissin Control Protocol

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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: Transmission Control Protocol 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: Transmission Control Protocol 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 Reference: Internet Protocol 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 Answer: D Difficulty: Moderate Reference: Transport and Network Layer Protocols

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The newer form of IP, version 6 (Ipv6): a. Is 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: Transmission Control Protocol/Internet Protocol Assume that more than one application program is 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: Linking to the Application Layer 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: Segmenting 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: Segmenting

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A TCP connection is established in the ___________ routing method. a. asynchronous b. connection-oriented c. frequency division d. application net e. connectionless Answer: B Difficulty: Moderate Reference: Connected-Oriented Messaging

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_____________ 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: Connectionless Messaging

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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: Connectionless Messaging ______________ 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 Reference: Connectionless Messaging

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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 Answer: D Difficulty: Moderate Reference: Connectionless Messaging 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 Reference: Quality of Service 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 Answer: B Difficulty: Moderate Reference: Addressing 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: Assigning Addresses

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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 Reference: Internet Addresses IPv6 is based upon _________ -byte addresses. a. 32 b. 24 c. 4 d. 16 e. 8 Answer: D Difficulty: Moderate Reference: Internet Addresses IPv4 uses ________ bytes per Internet address. a. 4 b. 32 c. 8 d. 24 e. 16 Answer: A Difficulty: Easy Reference: Internet Addresses 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: Subnets

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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: Subnets 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: Dynamic Addressing ___________ 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 Reference: Server Name Resolution 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 Answer: E Difficulty: Moderate Reference: Server Name Resolution

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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: Server Name Resolution 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: Data Link Layer Address Resolution _________ 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: Data Link Layer Address Resolution ___________ 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: Routing

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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: Routing 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 Reference: Routing 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: Types of Routing 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: Centralized Routing

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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: Dynamic Routing ____________ 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 Reference: Static Routing _______________ is a type of dynamic routing. a. Static routing b. Circuitous routing c. Centralized routing d. Link state e. X.25 routing Answer: D Diffic...