1. Which statements are true regarding UDP?

Answers:

  1. It is a connectionless service
  2. It is less reliable as compared to TCP
  3. It uses handshaking
  4. It is slow as compared to TCP

2. Which are the two valid IP addresses in the subnets of 192.168.10.0 network with a subnet mask of 255.255.255.248?

Answers:

  1. 192.168.10.1
  2. 192.168.10.24
  3. 192.168.10.63
  4. 192.168.10.5

3. Which of the following ranges are reserved as private addresses?

Answers:

  1. 10.0.0.0 — 10.255.255.255
  2. 192.168.0.0 — 192.255.255.255
  3. 172.16.0.0 — 172.31.255.255
  4. 172.16.0.0 — 172.255.255.255

4. What is the class of IP address 128.10.15.24?

Answers:

  1. Class A
  2. Class B
  3. Class C
  4. Class D

5. What is the port number used by HTTP?

Answers:

  1. 21
  2. 23
  3. 80
  4. 112

6. Which Protocol uses port number 21?

Answers:

  1. FTP
  2. SMTP
  3. Telnet
  4. HTTP

7. If UDP receives datagrams that are not in a sequence, what will it do?

Answers:

  1. It will arrange them in a sequence using sequence numbers
  2. It will request source host to resend datagrams
  3. It will drop datagrams that are not in sequence
  4. None of the above

8. How can a host resolve an IP address of another host located on the same subnet without needing to send a broadcast?

Answers:

  1. By requesting the physical address of the destination host
  2. By requesting the physical address of the router
  3. By accessing the routing table
  4. If the entry is already in the source host’s ARP cache
  5. The host cannot resolve the IP address without sending a broadcast

9. Which file transfer Protocol uses UDP as a transport Protocol and lacks security?

Answers:

  1. TFTP
  2. FTP
  3. RPC
  4. DHCP

10. What kind of message can an SNMP agent generate?

Answers:

  1. A trace message
  2. An SNMP message
  3. An alert message
  4. A trap message
  5. A get message

11. In TCP/IP, what is the Windowing mechanism used for?

Answers:

  1. It performs error checking
  2. It enables the lost segments to be detected and retransmitted
  3. It enables TCP to control the flow of data
  4. It appends a header to the data that is received
  5. It establishes a session

12. What is the purpose of a DHCP relay agent?

Answers:

  1. To maintain the database of TCP/IP configurations
  2. To forward DHCP requests to a DHCP server from DHCP clients in a subnet that does not contain a DHCP server
  3. To provide IP configuration settings that should be applied to all DHCP clients in all subnets
  4. To create a client reservation for a DHCP client
  5. To relay messages from one DHCP client to another DHCP client

13. Which of the following is a valid host IP address?

Answers:

  1. 200.100.100.31/27
  2. 200.100.100.32/26
  3. 200.100.100.40/29
  4. 200.100.100.51/30

14. Which one of the following addresses can be used as a host address for the subnet 200.100.10.64/27?

Answers:

  1. 200.100.10.32
  2. 200.100.10.95
  3. 200.100.10.64
  4. 200.100.10.90

15. Which of the following Protocols use port number 25?

Answers:

  1. TFTP
  2. POP3
  3. SMTP
  4. HTTP

16. What is maximum number of hosts allowed on subnet 172.20.64.0/23?

Answers:

  1. 510
  2. 512
  3. 1024
  4. 256

17. What is the binary value of 157?

Answers:

  1. 11000111
  2. 10111001
  3. 11100011
  4. 10011101

18. What is the default subnet mask for a Class C network?

Answers:

  1. 255.0.0.0
  2. 255.255.0.0
  3. 255.255.255.0
  4. 255.0.0.255
  5. 0.0.255.255

19. Which of the following indicates a local class C subnet?

Answers:

  1. xxx.xxx.xxx.0
  2. xxx.0.0.1
  3. xxx.xxx.0.126
  4. xxx.xxx.xxx.256
  5. xxx.xxx.xxx.255

20. Which protocol matches the remote host’s physical address to a given IP address?

Answers:

  1. TCP
  2. IP
  3. ARP
  4. UDP
  5. ICMP

21. In which class of addresses does the first octet specify the network ID and the last three octets specify the host ID?

Answers:

  1. Class A
  2. Class B
  3. Class C
  4. Class D
  5. Class E

22. Which protocol is used to transfer information between a WWW server and a WWW browser?

Answers:

  1. FTP
  2. UDP
  3. HTTP
  4. IP
  5. ICMP

23. By default how many subnets can you create with a Class B network address using a subnet mask of 255.255.252.0?

Answers:

  1. 0
  2. 255
  3. 64
  4. 6
  5. 252

24. What TCP/IP configuration settings are required for a computer to be able to communicate outside of its local subnet?

Answers:

  1. The IP address of the computer outside the subnet
  2. A unique IP address, a subnet mask and the IP address of a default gateway
  3. The IP address of the default gateway
  4. A custom subnet mask
  5. The physical address of the destination computer

25. How is a subnet mask specified for supernetting?

Answers:

  1. The host ID portion of a class address is extended to use a portion of the network ID
  2. The host ID portion is reduced
  3. The total number of bits used for IP addressing is increased
  4. The subnet mask need not be specified for supernetting
  5. The number of hosts on the network is decreased

26. After a host name is resolved to an IP address, what does a local host need to do next to communicate with the target host if the target host resides on the same subnet?

Answers:

  1. Send an ARP broadcast to the router
  2. Send an ARP broadcast to the DHCP server and the local subnet
  3. Resolve the IP address to a physical address using ARP
  4. Update the routing table
  5. Scan the local LMHOSTS file for the requested name

27. How many subnets are available in a class B network with subnet mask of 255.255.255.0?

Answers:

  1. 256
  2. 512
  3. 64
  4. 1024

28. Which of the following is definitely a broadcast address for a class C network having Subnet Mask 255.255.255.0?

Answers:

  1. xxx.xxx.xxx.0
  2. xxx.xxx.255.1
  3. xxx.xxx.xxx.126
  4. xxx.xxx.xxx.254
  5. xxx.xxx.xxx.255
  6. None of the above

29. What is the binary value of hex 9F?

Answers:

  1. 10011111
  2. 10111000
  3. 11110001
  4. 10001111

30. How do you resolve IP addresses locally?

Answers:

  1. By typing Resolve IP address ip-address
  2. By typing ARP-s ip-address
  3. With an ARP request and an ARP reply
  4. With a RARP request and a RARP reply
  5. By sending a broadcast

31. Which IP address class does the following IP address belong to?

78.34.6.90

Answers:

  1. Class A
  2. Class B
  3. Class C
  4. Class D
  5. Class E

32. To which subnet does the IP address 10.120.100.255/18 belong to?

Answers:

  1. 10.120.96.0
  2. 10.120.100.0
  3. 10.120.64.0
  4. 10.0.0.0

33. Assuming that none of the hosts has cached the entries, how many ARP broadcasts would be required for a host on one subnet to communicate with a host on a remote subnet that is separated by a single router?

Answers:

  1. 0
  2. 1
  3. 2
  4. 3
  5. 4

34. Which utility should you use to test whether TCP/IP has been initialized on a computer?

Answers:

  1. ipconfig
  2. init
  3. trace
  4. ping

35. Which protocol does the ping command use when attempting to test whether a remote host is running?

Answers:

  1. IP
  2. UDP
  3. ICMP
  4. IGMP
  5. ARP

36. What does the HOSTS file contain?

Answers:

  1. IP addresses and NetBIOS names
  2. Physical addresses of each host
  3. IP addresses of each host
  4. IP address-to-NetBIOS name mappings
  5. An entry for each host’s IP address followed by the host name

37. Which protocols does SNMP use when sending messages between subnets?

Answers:

  1. IP and UDP
  2. TCP and IP
  3. FTP and TCP
  4. ICMP and UDP

38. Which of the following is a valid unicast IP address?

Answers:

  1. 127.0.0.1
  2. 224.50.72.10
  3. 172.30.50.15/30
  4. 192.168.1.5/30

39. State whether true or false.

TCP is less reliable but faster than UDP.

Answers:

  1. True
  2. False

40. Which of the following Protocols can automatically provide IP address, subnet mask, default gateway and DNS server’s IP address to a client on a network?

Answers:

  1. FTP
  2. SMTP
  3. ARP
  4. DHCP

41. How many hosts can you assign with a Class C network address using a subnet mask of 255.255.255.192?

Answers:

  1. 255
  2. 62
  3. 6
  4. 2046
  5. 0

42. Your Company has a class C network. Your company requires 6 usable subnets, with 20 hosts in each subnet. Which subnet mask will you use?

Answers:

  1. 255.255.255.0
  2. 255.255.255.240
  3. 255.255.255.224
  4. 255.255.255.192

43. What are some of the keywords that can be included in your LMHOSTS file?

Answers:

  1. #HOSTS
  2. #LM
  3. #FIRST
  4. #MH
  5. #PRE

44. Which of the following address is reserved for loopback tests?

Answers:

  1. 10.0.0.1
  2. 127.0.0.1
  3. 172.16.0.1
  4. 192.168.0.1

45. You have 350 computers spread across eight subnets with two DHCP servers. You want each workstation to receive an IP address even when one of the DHCP servers is down. What should you do?

Answers:

  1. Create eight DHCP scopes on each DHCP server
  2. Create four DHCP scopes on each DHCP server
  3. Create two global DHCP scopes on each DHCP server
  4. Create one global DHCP scope on each DHCP server
  5. Create three global DHCP scopes on each DHCP server

46. Which of the following addresses are reserved for multicasting?

Answers:

  1. Class A addresses
  2. Class B addresses
  3. Class C addresses
  4. Class D addresses
  5. Class E addresses

47. What is the binary value of hex BF?

Answers:

  1. 10100000
  2. 10111111
  3. 11111000
  4. 00111011

48. On which layer of OSI (Open Systems Interconnection) model do TCP and UDP work?

Answers:

  1. Presentation Layer
  2. Network Layer
  3. Physical Layer
  4. Transport Layer

49. Which class address has the beginning range of 192.0.0.1 and the ending range of 223.255.255.254?

Answers:

  1. Class A
  2. Class B
  3. Class C
  4. Class D
  5. Class E

50. How many hosts can a Class A network accommodate?

Answers:

  1. 24
  2. 7
  3. 126
  4. 127
  5. Over 16 million

51. Your network has an IP of 150.150.0.0 and you need to divide it into multiple subnets. You need 600 host IDs for each subnet, with the largest amount of subnets available. Which subnet mask should you assign?

Answers:

  1. 255.255.224.0
  2. 255.255.240.0
  3. 255.255.248.0
  4. 255.255.252.0
  5. 255.255.0.0

52. How many bits are used to represent an IPv4 address?

Answers:

  1. 8
  2. 16
  3. 24
  4. 32
  5. 128

53. What is the broadcast address of IP address 172.16.10.0 with a subnet mask of 255.255.252.0?

Answers:

  1. 172.16.10.255
  2. 172.16.12.255
  3. 172.16.11.255
  4. 172.16.15.255

54. How can you prevent a DHCP server from assigning an IP address to a DHCP client when that address is within the range of addresses defined in a DHCP scope?

Answers:

  1. Deny the request
  2. Redefine the DHCP scope
  3. Increase the range of IP addresses
  4. Create a client reservation for future reference
  5. Create an exclusion range containing the IP address

55. Which Protocol is used to obtain the MAC address from a given IP address?

Answers:

  1. ARP
  2. SMTP
  3. IARP
  4. RARP

56. If you have a subnet mask of /27 for a class C network, how many subnets and host per subnet will you get?

Answers:

  1. 4 networks and 62 hosts
  2. 64 networks and 4 hosts
  3. 32 networks and 8 hosts
  4. 8 networks and 30 hosts

57. You have four Class C network addresses:

203.200.5.0, 203.200.6.0, 203.200.7.0 and 203.200.8.0

You want to combine these addresses into one logical network to increase the host IDs that you can have on one subnet. Which subnet mask should you assign?

Answers:

  1. 255.255.252.0
  2. 255.255.254.0
  3. 255.255.255.252
  4. 255.255.255.254
  5. 255.255.0.0

58. What is the network ID of IP address 172.30.60.0/20?

Answers:

  1. 172.30.16.0
  2. 172.30.48.0
  3. 172.30.32.0
  4. 172.30.0.0

59. What is the purpose of the metric value in a routing table?

Answers:

  1. It specifies the number of entries in the routing table
  2. It specifies the IP address of the router
  3. It specifies the default gateway address
  4. It is used to find the best route to the desired network
  5. It specifies the subnet mask

60. Which of the following Protocols is used as a security Protocol and is also one of the secure encryption systems used in communication?

Answers:

  1. SMTP
  2. Kerberos
  3. TFTP
  4. DNS

61. What is the default time-to-live (TTL) value for an entry in the ARP cache?

Answers:

  1. 30 seconds
  2. 60 seconds
  3. 2 minutes
  4. 90 seconds
  5. 1 minute
  6. Depends on OS

62. Which address classes cannot be assigned to host computers?

Answers:

  1. Class A and Class B
  2. Class B and Class C
  3. Class D and Class E
  4. Class C and Class D
  5. Class A and Class E

63. What is the maximum life time of an entry in the Dynamic ARP cache?

Answers:

  1. 2 minutes
  2. As specified by the system administrator
  3. ARP entries are permanent
  4. 30 seconds
  5. 10 minutes

64. You have a Class A network address with 60 subnets. You need to add 40 new subnets in the next two years and still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?

Answers:

  1. 255.240.0.0
  2. 255.248.0.0
  3. 255.252.0.0
  4. 255.254.0.0
  5. 255.0.0.0

65. At what point does a DHCP client attempt to renew its lease?

Answers:

  1. When 1/2 of the lease period has expired
  2. When 3/4 of the lease period has expired
  3. When 2/3 of the lease period has expired
  4. When 1/3 of the lease period has expired
  5. After the lease period has expired

66. When is supernetting required?

Answers:

  1. When the host address should not be partitioned for the purpose of subnetting
  2. When a single subnet needs more host IDs than provided by the class of address
  3. When a host ID has to be divided into two parts
  4. When network performance needs to be improved
  5. When a subnet needs to be isolated

67. What is the maximum number of usable subnets that you can create in a class B network?

Answers:

  1. 32768
  2. 65536
  3. 16384
  4. Infinite

68. Which Protocol is used to find the IP address from the name of a website/host?

Answers:

  1. FTP
  2. SNMP
  3. DNS
  4. POP3

69. What must be specified as part of a client reservation?

Answers:

  1. An IP address and the physical address of the network adapter used by the DHCP client
  2. Scope Options
  3. Global Options
  4. Client Options
  5. The IP address of one or more DHCP server

70. What is the maximum number of valid IP addresses in a class C network?

Answers:

  1. 256
  2. 512
  3. 65536
  4. 254

71. Which of the following is a Multicast Address?

Answers:

  1. 127.0.0.1
  2. 224.10.1.7
  3. 192.168.0.255
  4. 10.0.0.0

72. You have a Class B network and you plan to break it up into seven subnets. One subnet will be connected to the Internet, but you want all computers to have access to the Internet. How should you assign the subnet mask on the router for the networks?

Answers:

  1. By using a default subnet mask
  2. By assigning a subnet mask of 0.0.0.0
  3. By assigning a subnet mask of 255.255.255.0
  4. By assigning a subnet mask that has the IP address of the router
  5. By creating a custom subnet mask

73. Which of the following is a universal and uniform numeric identifier for each computer on the network?

Answers:

  1. IP address
  2. Physical address
  3. ARP
  4. Domain Name System
  5. RARP

74. Which of the following Protocols is used for transferring electronic mail?

Answers:

  1. FTP
  2. SNMP
  3. ARP
  4. SMTP

75. Which technique enables a single network address to span multiple physical networks?

Answers:

  1. Multihoming
  2. Multicasting
  3. Multitasking
  4. Subnetting
  5. Supernetting

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