Networking Test 4 Study Guide

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1 Networking Test 4 Study Guide True/False Indicate whether the statement is true or false. 1. IPX/SPX is considered the protocol suite of the Internet, and it is the most widely used protocol suite in LANs. 2. The Internetwork layer is the layer that handles network configuration and is considered the heart of the TCP/IP protocol suite. 3. The Transport layer uses port numbers to identify the source and destination Application-layer protocol of the data that it contains. 4. The Transport layer is the same in both the OSI model and the TCP/IP model. 5. The maximum transmission unit for Ethernet is 1518 bytes. Multiple Choice Identify the choice that best completes the statement or answers the question. 6. The Transport layer deals with which unit of information? a. frame b. packet c. signal d. segment 7. Which of the following is not a function of the Network Access layer? a. transmits and receives bit signals b. delivers packets efficiently c. provides a MAC address for the network interface d. receives packets form the Internetwork layer and creates the frame 8. In what layer does the NIC operate? a. Network Access b. Internetwork c. Transport d. Application 1

2 Name: 9. In which layer does a router operate? a. Network Access b. Internetwork c. Transport d. Application 10. Which protocol is responsible for determining the MAC address associated with each IP address and keeping a table of its results? a. MAC b. DNS c. ARP d. NAT 11. TCP establishes a connection with the destination device using which process? a. encapsulation b. flow control c. windowing d. three-way handshake 12. Which of the following is not an Application layer protocol? a. DNS b. TCP c. DHCP d. SMTP 13. An IP address consists of four octets separated by periods. Which part of this address denotes its class? a. first octet b. second octet c. third octet d. fourth octet 14. How many host addresses are available on a Class C network? a. 254 b. 256 c d What is the decimal equivalent to the binary number ? a. 97 b. 160 c. 161 d

3 Name: 16. How many bits are in an IPv6 address? a. 32 b. 48 c. 64 d The last 64 bits of an IPv6 address are the interface identifier. Where is that number derived from? a. via DHCP b. a static entry c. from an ISP d. the MAC address 18. What is the decimal equivalent to the hexadecimal number D? a. 13 b. 15 c. 12 d How many bits are available in an IPv6 network for creating subnets when the prefix is /48 and the host ID is 64 bits? a. 48 b. 16 c. 32 d Which layer is responsible for establishing a connection between the source and destination? a. Application b. Session c. Transport d. Presentation 21. Which layer of the OSI model is responsible for encryption and decryption? a. Application b. Presentation c. Session d. Transport 22. What is a PDU? a. It is an Application layer protocol that handles delivery of messages. b. It is a unit of measurement for the maximum amount of data that can be transferred. c. It is the name given to the unit of information used by each layer. d. It is a Network layer protocol that handles path determination 3

4 Name: 23. What information would you find in the header of a Transport layer PDU? a. destination IP address b. cyclic redundancy check c. source MAC address d. window size 24. At each layer of the OSI model, data is appended to the original message and then sent on to the next lower layer. What is this process called? a. encapsulation b. deencapsulation c. packetization d. checkpointing 25. What does the Transport layer use to make sure that a message is reassembled correctly on the receiving device? a. source port number b. window Size c. destination port number d. sequence number 26. What is the IEEE standard that governs all forms of Ethernet media? a b c d Which is the IEEE standard that sets the standards for wireless networking? a b c d Which layer is responsible for determining the best path a packet should travel across an internetwork? a. Network b. Transport c. Session d. Data Link 29. One job that a router performs is that of gatekeeper, which means that it can be configured to only allow certain packets access into the network based on a list of rules. What is that process called? a. media control b. packet forwarding c. access control d. signal bounce 4

5 Name: 30. You are working at the help desk and you get a message that a user cannot access the Internet. You open a command prompt, ping the workstation s IP address, and get a response. You ask the user to try the Internet again. He does so with the same result no connection. Which type of device is most likely to be the problem? a. Physical layer device b. Data Link layer device c. Network layer device d. Presentation layer device 31. Which layer has been subdivided into the Logical Link Control sublayer and the Media Access Control sublayer? a. Physical b. Data Link c. Network d. Transport 32. What layer is responsible for making sure that the data that it sends and receives is in a format that the receiving and sending computers can understand? a. 7 b. 6 c. 5 d At what layer do NICs operate? a. Transport b. Data Link c. Physical d. Network 34. Which layer is responsible for the encoding of signals? a. 3 b. 1 c. 5 d The Transport layer segments data into smaller chunks, the size of which is determined by which of the following? a. MTU b. LLC c. PDU d. TCP 5

6 Name: Completion Complete each statement. 36. An IP address is composed of two parts, one is the ID and one is the host ID. 37. are sets of rules and procedures that dictate communication and behavior. 38. is a way of breaking a large address space into more, smaller, address spaces. 39. The four layers of the TCP/IP protocol suite are Application,, Internetwork, and Network Access. 40. An address that can only be used on the internal network and cannot be used to access the Internet is called a address. 41. The reference model is a general framework for networking systems that uses a layered approach to reduce its complexity. 42. The layer is the bottom layer, whose job it is to convert bits into signals and vice versa. 43. The process of stripping the header and trailer from a PDU is called. 44. The PDU at the Data Link layer is called a. 45. The layer of the TCP/IP model combines the top three layers of the OSI model into one layer. Matching a. ARP b. APIPA c. CIDR d. DNS e. DHCP f. IMAP g. NAT h. POP3 i. TCP j. UDP 46. method of IP addressing that allows more efficient use of IP addresses 6

7 Name: 47. dynamically configures IP address 48. protocol in which is downloaded to the host computer 49. Transport layer protocol that is connectionless 50. translates private IP address to public IP address 51. resolves IP address to MAC address 52. Transport layer protocol that is connection-oriented and reliable 53. type of address that is automatically assigned when no DHCP server can be contacted 54. protocol in which only headers are downloaded to the host until the message is opened 55. resolves computer names to IP addresses Short Answer 56. What are four tasks or responsibilities of the Internetwork layer? 57. Briefly describe ARP, include the meaning of its acronym and the layer in which it functions. 58. Explain how Tracert uses an ICMP packet and the TTL value to map the path to an IP address. 59. How does TCP provide flow control and reliability? 60. Briefly describe the three-way handshake that TCP uses to establish a connection. 61. What does APIPA stand for, and what does it do? 62. What is the function of DNS, and at which layer does it operate? 63. Briefly describe an IP address. 64. A range of addresses is reserved for private addressing in each class. What are those ranges? 65. What is the difference between TCP and UDP? 66. What are the benefits to using a layered approach? 67. List the layers of the OSI model from the top down, along with their counterparts in the TCP/IP model. 68. Name the PDU at each layer of the OSI model. 69. What does 802 refer to in the IEEE 802 standard? 70. The Transport layer PDU includes a field for window size. What is the window size? 7

8 Name: 71. How does window size provide flow control? 72. What does the Data Link layer do with a frame after it receives it? 73. What is encoding, and where does it take place? 74. In regards to the OSI Reference Model, what is peer communication? 75. What are the sublayers of the Data Link layer, and what do they do? 8

9 Networking Test 4 Study Guide Answer Section TRUE/FALSE 1. ANS: F PTS: 1 REF: Page ANS: T PTS: 1 REF: Page ANS: T PTS: 1 REF: Page ANS: T PTS: 1 REF: Page ANS: T PTS: 1 REF: Page 270 MULTIPLE CHOICE 6. ANS: D PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: C PTS: 1 REF: Page ANS: D PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: D PTS: 1 REF: Pages ANS: D PTS: 1 REF: Page ANS: D PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: C PTS: 1 REF: Page ANS: D PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: D PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: D PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: C PTS: 1 REF: Page ANS: C PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: A PTS: 1 REF: Page 270 1

10 COMPLETION 36. ANS: network PTS: 1 REF: Page ANS: Protocols PTS: 1 REF: Page ANS: Subnetting PTS: 1 REF: Page ANS: Transport PTS: 1 REF: Page ANS: private PTS: 1 REF: Page ANS: OSI PTS: 1 REF: Page ANS: Physical PTS: 1 REF: Page ANS: deencapsulation PTS: 1 REF: Page ANS: frame PTS: 1 REF: Page ANS: Application PTS: 1 REF: Page 265 MATCHING 46. ANS: C PTS: 1 REF: Page ANS: E PTS: 1 REF: Page ANS: H PTS: 1 REF: Page ANS: J PTS: 1 REF: Page ANS: G PTS: 1 REF: Page ANS: A PTS: 1 REF: Page ANS: I PTS: 1 REF: Page ANS: B PTS: 1 REF: Page ANS: F PTS: 1 REF: Page ANS: D PTS: 1 REF: Page 227 2

11 SHORT ANSWER 56. ANS: It is responsible for routing packets through the internetwork. It uses ARP to find MAC addresses from IP addresses. It is responsible for delivering packets efficiently. It is responsible defining and verifying source and destination IP addresses. PTS: 1 REF: Page ANS: ARP stands for Address Resolution Protocol, and it functions in the Internetwork layer. ARP s job is to find the MAC address of a device given its IP address. PTS: 1 REF: Page ANS: Tracert sends an ICMP to the IP address with a TTL value of 1. When the first router receives the packet it decrements the TTL to 0, discards the packet, and sends a TTL-expired packet to the sending computer. When the sending computer receives the TTL-expired packet, it notes the address of the first router. Then it sends a second packet with a TTL of 2. This time the packet gets to the second router, is discarded, and the second router sends a TTL-expired packet. When Tracert receives this response, it notes the address of the second router. This continues until the packet reaches the intended IP address. PTS: 1 REF: Page ANS: TCP sets a maximum number of bytes to transmit before it must receive an acknowledgment of receipt from the receiving station. If it does not receive an acknowledgement within a certain period, it assumes an error has occurred and begins to retransmit the data since the last acknowledgement was received. PTS: 1 REF: Page ANS: When a client computer makes a request, TCP begins the session by sending the receiving computer, which is typically a server, a SYN segment. If the server is not busy, then it sends back an ACK-SYN packet acknowledging the creation of the session. Then the client computer sends back an ACK segment to finalize the connection. PTS: 1 REF: Page ANS: APIPA stands for Automatic Private IP Addressing. APIPA provides a computer with an IP address when the computer cannot contact a DHCP server. PTS: 1 REF: Page ANS: DNS allows computers to contact other computers using a familiar name instead of a hard-to-remember IP address. DNS keeps records of which name corresponds to which IP address in a DNS cache so that a frequently accessed address can be resolved quickly. DNS is an Application layer protocol. PTS: 1 REF: Pages

12 63. ANS: An IP address is a 32-bit number divided into 4, 8-bit octets that are separated by periods, which is called dotted decimal notation. The first octet denotes the class of the IP address. Each octet can have a value from 0 to 255. The address has two parts one is the network ID and the other is the host ID. The network portion of the address is determined by the subnet mask. PTS: 1 REF: Pages ANS: For Class A, all addresses beginning with 10 For Class B, addresses from to For Class C, addresses from to PTS: 1 REF: Page ANS: TCP and UDP are both Transport layer protocols, but TCP is considered reliable and UDP is considered unreliable. TCP is connection-oriented, which means that it forms a connection before it transmits data, thereby ensuring that the recipient is ready and waiting. The sender also waits for acknowledgements after sending data. This behavior makes it reliable. UDP is connectionless, so it sends data and doesn t wait to see whether anyone is listening; no acknowledgements are involved in the communication. PTS: 1 REF: Pages ANS: In a layered approach, each layer is only responsible for a specific task instead of the end-to-end communication. Therefore, when a problem occurs, it is easier to pinpoint the layer that is affected and then troubleshoot only that issue. In addition, by using a layered approach, upgrades in technology can be to individual layers without affecting the others. PTS: 1 REF: Page ANS: Application Application Presentation Application Session Application Transport Transport Network Internetwork Data Link Network Access Physical Network Access PTS: 1 REF: Pages ANS: The PDU for the Application, Presentation, and Session layers is data. The PDU at the Transport layer is a segment, at the Network layer is a packet, and at the Data Link layer is a frame. The final PDU is in the form of bits at the Physical layer. PTS: 1 REF: Page ANS: It is the project name that was given to the standard that defines all physical elements of networking communications. It represents the year and the month that the project began February of PTS: 1 REF: Page 275 4

13 70. ANS: The window size is a negotiated amount between the transmitting and receiving devices that sets the amount of data that can be transferred before an acknowledgement must be sent and received. PTS: 1 REF: Page ANS: When the window size is reached and no acknowledgement is received, then the transmitting device assumes there is a problem and begins to retransmit. If this happens, the window size is reduced, thus causing the transmitting device to send a smaller amount of data and relieving the load on the receiving device. PTS: 1 REF: Page ANS: First, it checks the destination MAC address to make sure that it is intended for itself. Then it calculates the CRC and compares it to the incoming frame s CRC to make sure that the values are the same. Next, it strips off the header and trailer information. Then the resulting packet is sent up to the Network layer. PTS: 1 REF: Page ANS: Encoding is a process performed by the Physical layer that takes the frame from the Data Link layer and changes it into 1s and 0s to be transmitted onto the medium. The type of signal that it is changed into is dependent on the type of media. PTS: 1 REF: Page ANS: Peer communication refers to the way that each layer on a transmitting computer communicates with the same layer on the receiving computer, just as though they were in direct contact. PTS: 1 REF: Pages ANS: The first layer is the Logical Link Control sublayer, and it is responsible for handling some kinds of error recovery and flow control. The second layer is the Media Access Control sublayer, and it is responsible for providing the MAC address. It also controls the way in which a device will access the network. PTS: 1 REF: Page 278 5

14 Networking Test 4 Study Guide [Answer Strip] _ B 9. _ D 16. _ D 23. _ C 30. _ F 1. _ C 10. _ D 17. _ A 24. _ T 2. _ B 31. _ T 3. _ A 18. _ D 11. _ D 25. _ T 4. _ T 5. _ B 19. _ B 32. _ B 12. _ B 26. _ D 6. _ B 20. _ B 33. _ A 13. _ D 27. _ B 7. _ B 21. _ B 34. _ A 14. _ A 28. _ A 8. _ C 22. _ A 35. _ D 15. _ C 29.

15 Networking Test 4 Study Guide [Answer Strip] _ E 47. _ H 48. _ J 49. _ G 50. _ A 51. _ I 52. _ B 53. _ F 54. _ D 55. _ C 46.

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