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1. (TCO 6) An address that identifies an application at the transport layer is: (Points : 5)

ARP IP MAC Port Address

Question 2. 2. (TCO 6) The Pv4 address range 169.254.0.0/16 is reserved for: (Points : 5)

Link-Local addresses Loopback addresses Broadcast addresses Addresses for self-identification

Question 3. 3. (TCO 6) The first four bits of the IPv4 addresses reserved for research are: (Points : 5)

0000 1000 1110 1111

Question 4. 4. (TCO 6) To determine how many digits are used for the network identifier in an IPv4 address, you must look at the: (Points : 5)

subnet mask binary mask MAC mask TCP/IP mask

Question 5. 5. (TCO 6) Which one of the following IPv4 addresses cannot be used as the destination address in an IPv4 packet? (Points : 5)

12.0.0.0/8 12.0.0.1/8 12.5.5.5/8 12.255.255.254/8

Question 6. 6. (TCO 6) Number of addresses in the IPv4 address block 193.17.8.128/25 is: (Points : 5)

25 256 128 none of the above

Question 7. 7. (TCO 6) The subnet mask for the address block 163.248.248.0/21 is: (Points : 5)

255.0.0.0 255.255.0.0 255.255.248.0 255.255.255.21

Question 8. 8. (TCO 6) Which one of the following subnets does the IPv4 address 154.180.0.58 255.255.255.248 belong to? (Points : 5)

154.180.0.0/29 154.180.0.32/29 154.180.0.48/29 154.180.0.56/29

Question 9. 9. (TCO 6) One of the nodes in a broadcast domain is assigned the IPv4 address 152.165.113.126/21. Which one of the following IPv4 addresses cannot be assigned to any of the other nodes in the same broadcast domain? (Points : 5)

152.165.115.254/21 192.168.118.160/21 192.168.111.253/21 192.168.117.158/21

Question 10. 10. (TCO 6) What is the maximum number of subnets with 255.255.255.248 mask in a class C network? (Points : 5)

5 8 32 64

Question 11. 11. (TCO 6) The protocol used to map IP addresses to their physical addresses is: (Points : 5)

IP Addressing ARP RARP CIDR

Question 12. 12. (TCO 6) The IP header has a minimum length of: (Points : 5)

5 bytes 15 bytes 20 bytes none of the above

Question 13. 13. (TCO 6) The TTL keeps track of ____________ to decide whether a datagram is discarded. (Points : 5)

Time Message size Fragments Number of routers passed through

Question 14. 14. (TCO 7) All of the following apply to ICMP EXCEPT: (Points : 5)

It is a Layer 3 protocol It is a routable protocol It compensates for IP’s connectionless messaging drawback It is independent of the IP header

Question 15. 15. (TCO 7) All of the following are ICMP error-reporting messages EXCEPT: (Points : 5)

Protocol mismatch error Destination unreachable Source quench Redirect

Question 16. 16. (TCO 7) The IANA defined three port categories. Which of the following is NOT a port category? (Points : 5)

Static Well-known Registered Dynamic

Question 17. 17. (TCO 7) The following are advantages that TCP has over UDP EXCEPT: (Points : 5)

It is more reliable than UDP It provides acknowledgement information, UDP does not It is faster than UDP It guarantees delivery of datagrams, UDP does not

Question 18. 18. (TCO 7) TCP uses all of the following error detection methods EXCEPT: (Points : 5)

FEC Checksum Acknowledgement Time-out

Question 19. 19. (TCO 7) Which of the following protocols uses TCP port 443? (Points : 5)

HTML HTTPS TFTP Telnet

Question 20. 20. (TCO 6) Which of the following protocols use both TCP and UDP? (Points : 5)

FTP SMTP Telnet DNS

Question 21. 21. (TCO 7) UDP is called a ________________transport protocol. (Points : 5)

Connectionless, reliable Connection-oriented, unreliable Connectionless, unreliable none of the above

Question 22. 22. (TCO 1) Which of the following is considered a disadvantage of a client/server network? (Points : 5)

It is difficult to manage data storage and backups It is the least secure network architecture It requires dedicated management staff User accounts are managed locally on each network computer

Question 23. 23. (TCO 3) Clients in Philadelphia area need to access content in a server located in the Boston area. The packets need to cross several hops to make it to the server. Which OSI layer governs the standards related to this requirement? (Points : 5)

Application Session Transport Network

Question 24. 24. (TOC 4) Which of the following could not be an Ethernet source address? (Points : 5)

8A-7B-6C-DE-10-00 8B-32-21-21-4D-34 EE-AA-C1-23-45-32 46-56-21-1A-DE-F4

Question 25. 25. (TCO 5) _______ encoding has a transition at the middle of each bit. (Points : 5)

RZ Manchester Differential Manchester all of the above

1. (TCO 6) Show the subnet address, subnet mask in slash notation, broadcast address, number of addresses, first valid host address, and the last valid host address for the subnet address of the host with IP v4 address: 172.16.10.5 255.255.248.0 (Points : 15)

Question 2. 2. (TCO6) An IPv4 header bytes in Hex notation is given below: 45 c0 00 38 9b 3e 00 00 ff 01 fd 3b 80 99 90 01 80 99 91 56. Answer the following questions about the header: What is the size of data in the IPv4 datagram? What type of higher-level protocol is this datagram carrying? How many more hops can the datagram travel without being dropped? What are source and destination IP addresses for the IPv4 header? (Points : 15)

Question 3. 3. (TCO 7) A router with IPv4 address 125.45.23.12 and the MAC address 23:45:AB:4F:67:CD has received a packet for a host destination with IP address 125.11.78.10. Show the entries in the ARP request packet sent by the router. (Points : 15)

Question 4. 4. (TCO 7) A client sends 1024 bytes of data to a server using TCP protocol. Calculate the efficiency of this transmission at the TCP level (ratio of data excluding header to the total bytes transmitted). Calculate the efficiency of transmission at the IP level. Assume no options for the header and no errors. Calculate the efficiency of transmission at the data link layer. Assume no options for IP header and Ethernet-II format are used at the data link layer. (Points : 15)

Question 5. 5. (TCO 2) Given the following encoded signal form (The space between two vertical dashed lines indicates one bit-time), what is the data represented by the signal if the waveform uses the following encoding rule: “A 0 is represented with a low-to-high transition in the center of the bit, and a 1 is represented with a high-to-low transition in the center of the bit”

Question 6. 6. (TCO 4) A system uses the Selective Repeat protocol with a window size of 4. If each packet carries 1000 bits of data, how long does it take to send 1 million bits of data if the distance between the sender and receiver is 5000 Km and the propagation speed of the signal is 2x10^8 meters per second? Ignore transmission, waiting, and processing delays. Assume no errors in the link. (Points : 15)

Question 7. 7. (TCO 2) You are given three channels A, B, and C with Bit Error Rates 10-6 , 10-5 , and 10-9 respectively. Which channel is best? And what is the number of errors that you will likely see on that channel when you transmit a one mega-bit file? (Points : 15)

Question 8. 8. (TCO 3) An asynchronous link transmits at 2400 bits per second. If the clock in the receiver is running 2% slow, how many bits are received correctly before an error occurs due to loss of synchronization? Assume that both the transmitter and receiver clocks start at the same time. (Points : 15)

Question 1. 1. (TCO 6) For the following network of routers, switches, and hosts, come up with an efficient address assignment scheme that assigns IPv4 addresses for each network layer interface in the network from IPv4 address range 180.16.5.0/24. How many addresses are still left over for future assignment?