IT 377 Exam 2 Multiple Choice

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