IT 377 Exam 2 Multiple Choice

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In the mask 255.255.255.0, how many 1s are there?

24

In IP subnet planning, you need to have at least 130 subnets. How large should your subnet part be?

8 bits

Which of the following can offer speeds of about few gigabits per second?

802.11ac

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

Class D

Why is CSMA/CD not applicable to WLAN?

Collision signal cannot be detected.

The network service based on Address Resolution Protocol provides:

layer 3 to layer 2 mapping

802.11a supports ________ non-overlapping channels.

more than 8

The ARP protocol operates at the ______ layer.

network

Which of the following layer is responsible for providing end-to-end network reach-ability?

network layer

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

only the receiver

The highest-level DNS servers are called ________.

root servers

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:

.ilstu.edu

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

0

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

18

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

30

Internet Corporation for Assigned Names and Numbers (ICANN):

A&B (is a non-profit organization to maintain and assign IP addresses AND Determines what new Top Level Domains will be created ( .biz? .jobs?)

Which layer does DHCP protocol belong to?

Application Layer

802.11n is designed to operate in the ________ unlicensed band.

Both A&B (2.4GHz and 5 GHz)

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

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

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

PCF

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

They will interfere with each other

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

We cannot say

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

We cannot say

The total range of possible 802.11 WLAN frequencies in the 2.4 GHz band constitutes ________.

a service band

What is Network Allocation Vector (NAV)?

a timer to inform other station to wait

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

ad hoc and infastructure

Which layer does DNS protocol belong to?

application layer

Which of the following uses OFDM?

both A&B (802.11g and 802.11n)

Channels with wide bandwidths are called ________ channels.

broadband

Routing decision is based on:

destination IP address

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

domain

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

timer


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