Chapter 8 review IST-220

Given Class B network ID of 172.20.0.0 for its entire network and 15 subnets need. What is the incremental subnet variable (aka magic number) that you add to each Network ID to get the next NW ID that starts the next subnet range?

16

Given a host IP address of 172.16.1.154 and a subnet mask of 255.255.254.0, what is the network ID for this host?

172.16.0.0

What is the network ID with CIDR notation for the IP address 172.16.32.108 whose subnet mask is 255.255.255.0?

172.16.32.0/24

Given Class B network ID of 172.20.0.0 for its entire network and 15 subnets needed List all the subnets on a separate piece of paper and answer the following question -. What is the CIDR notation for the second subnet's network ID?

172.20.16.0/20

How many bits of a Class A IP address are used for host information?

24 bits

Given Class B network ID of 172.20.0.0 for its entire network and 15 subnets needed You can now calculate the subnet mask. The default subnet mask for a Class B network is 255.255.0.0, and so the third octet is the one that will change. What is the subnet mask for these subnets, written in decimal?

255.255.240.0

What is the formula for determining the number of possible hosts on a network?

2h - 2 = Z

Subnetting operates at Layer_________ while VLANS function at Layer_______.

3, 2

What is the least number of bits you would need to borrow from the network portion of a Class B subnet mask to get at least 130 hosts per subnet?

8

Which IEEE standard determines how VLANs work on a network?

802.1Q

Which formulas can be used to calculate the magic number? Choose two.

256- the interesting octet 2 to the power of H

Suppose your organization uses the Class B network ID of 172.20.0.0 for its entire network and wants to create 15 subnets. You first need to decide how many bits to borrow from the host address bits. Recall that you can use the formula 2n = Y. For the new subnets, how many bits must be borrowed from the host address portion? How many bits total will be used for identifying a host's subnet?

4, 20

Given Class B network ID of 172.20.0.0 for its entire network and 15 subnets needed . If 20 bits are used to identify the network and subnet, that leaves 12 bits to identify each host. Using the formula 2h - 2 = Z, how many host addresses are possible in each subnet? (You may use calculator for this step).

4094

While designing your network's VLAN topology, your team has decided to use a centrally managed DHCP server rather than creating a separate DHCP server for each VLAN. What software will you need in order to make the central DHCP server accessible across VLANs?

DHCP relay agent

What area of a network can provide less stringent security so a web server is more accessible from the open Internet?( use abbreviation)

DMZ

A hacker wants to orchestrate a VLAN hopping attack. Which of the method(s) below can he employ to do his attack?

Double Tagging Switch Spoofing

On which networking device do you configure VLANs? A ____________(one or two word answer)

Layer 2 switch

Which VLAN is designed to support administrative access to networking devices __________ VLAN?

Management

Which VLAN on a switch manages untagged frames?

Native VLAN

What do well-chosen subnets accomplish?

Network documentation is easier to manage.

Which of the following is not a good reason to segment a network?

To increase the number of networking devices on a network

Which port mode on a switch enables that port to manage traffic for multiple VLANs?

Trunk

Which IP addressing technique subnets a subnet to create subnets of various sizes?_____________(Use abbreviation)

VLSM

Which hexadecimal block in an IPv6 address is used for the Subnet ID?

the fourth one