IT 377 exam 2 study

30. Which layer does DHCP protocol belong to?

B) Application layer

32. Why is CSMA/CD not applicable to WLAN?

B) Collision signal cannot be detected

20 Routing decision is based on:

B) Destination IP address

21. Which layer does DHCP protocol belong to?

B) application layer

19. Which of the following layer is responsible for providing end-to-end network reachability?

C) network layer

27. we set up a DNS server for the domain .it.ilstu.edu, we need register this DNS server to the server responsible for the domain:

A) .ilstu.edu

25. What is the min size of the 802.11 frame body (payload)?

A) 0

28. The network service based on Address Resolution Protocol provides: a. Layer 3 to layer 2 mapping b. Layer 2 to layer 1 mapping c. Layer 3 to layer 1 mapping d. Layer 2 to layer 3 mapping e. None of above

A) Layer 3 to layer 2 mapping

24. If IP fragmentation occurred during IP packet delivery, which of the following network component will conduct reassembly?

A) Only the receiver

8. What happens if two nearby access points use the same channel?

A) They will interfere with each other.

18. The highest-level DNS servers are called ________. A) root servers B) first-level or top-level servers C) Both A and B D) Neither A nor B

A) root servers

29. Which layer does DNS protocol belong to?

B)Application layer

11. In IP subnet planning, you need to have at least 130 subnets. How large should your subnet part be? a. 6 bits. b. 8 bits. c. 14 bits. d. 16 bits. e. None of the above

B. 8 bits

3. Channels with wide bandwidths are called ________ channels.

Broadband

7. Which of the following can offer speeds of about few gigabits per second? A) 802.11g. B) 802.11n. C) 802.11ac. D) None of the above. E) B&C

C 802.11ac

6. 802.11n is designed to operate in the ________ unlicensed band. A) 2.4 GHz B) 5 GHz C) Both A and B D) Neither A nor B

C both A and B

10. The ARP protocol operates at the ______ layer. a. application b. data link c. network d. transport e. All of the above.

C network

13. In the mask 255.255.255.0, how many 1s are there? A) 8. B) 16. C) 24. D) 255. E) None of the above

C) 24

33. What is Network Allocation Vector (NAV)?

C) A timer to inform other station to wait

2. The total range of possible 802.11 WLAN frequencies in the 2.4 GHz band constitutes ________. A) a frequency spectrum B) a broadband C) a channel D) a service band E) All of the above.

D a service band

16. If /14 is a subnet mask, how many bits are there in the host part?

D) 18

23. When n=27 in "/n" or CIDR notation, how many valid IPs are available to be assigned to individual network interfaces?

D) 30

22. Which of the following statement about IP address assignment is true?

D) IP addresses from Class D and E cannot be assigned to any individual host

26. What are the two operational modes of 802.11-based WLAN?

D) ad hoc and infrastructure

17. In DNS, a group of resources under the control of an organization is called a ________.

D) domain

12. Each address in the following IP address class represents a group of hosts that all listen to one sender

D. Class D

31. Which wireless access method is better at supporting time-sensitive applications?

D. PCF

9. The network allocation vector (NAV) is really a ____________ that serves to avoid collisions on the Ethernet network.

D. timer

5. Which of the following uses OFDM? A) 802.11g. B) 802.11n. C) 802.11b D) All of the above E) Both A and B

E both A and B

14. If /14 is a subnet mask, how many bits are there in the network part?

E) We cannot say

15. If /14 is a subnet mask, how many bits are there in the subnet part?

E) We cannot say

4. 802.11a supports ________ non-overlapping channels.

More than 8

1. Internet Corporation for Assigned Names and Numbers (ICANN): a. Is a non-profit organization to maintain and assign IP addresses. b. Determines what new Top-Level Domains will be created (.biz? .jobs?) c. Determine what groups can register domain names d. All of the above

e A&b