CH5 Flashcards

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1
Q

Which of the following addresses is a valid IPv4 address?

  1. 168.1.256
  2. 1.25.2
    2001: 0000:4137:9e76:3c2b:05ad:3f57:fe98
    2001: 0000:4137:9g76:3c2b:05zd:3x57:gh98
A

10.1.25.2

IPv4 addresses are in dotted decimal format.
Each decimal must be between 0 and 255.
4 Octet Sets.

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2
Q

What class is the following IP Address 192.168.1.5?

Class A
Class B
Class C
Class D

A

Class C

Range is 192-224

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3
Q

The following two classful IP addresses have the same Network ID?
192.168.1.5 and 192.168.2.6

True
False

A

False

The first one has a network ID of 192.168.1.0, and the second one has a network ID of 192.168.2.0.

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4
Q

The following classful IP addresses have the same Network ID?
10.80.4.2 and 10.81.15.2

True
False

A

True

Both have a Network ID of 10.0.0.0

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5
Q

Another name for the “Default Gateway”?

A

The Router

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6
Q

What is the subnet mask for the following IP Address 192.168.1.5/26?

  1. 168.1.5
  2. 255.255.0
  3. 255.255.192
  4. 255.255.240
A

255.255.255.192

The /26 in the IP address is CIDR notation indicating how many bits are a 1 in the subnet mask. The first octet has eight 1s, the second octet has 8 1s, and the third octet has 8 1s, and the fourth octet has 2 1s.

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7
Q

Which of the following IP addresses is in one of the reserved IP address ranges defined by RFC 1918?

  1. 80.256.1
  2. 17.34.14
  3. 169.4.5
  4. 17.2.5
A

172.17.34.14

Reserved IP Ranges are as Follows:
10.0.0.1 through 10.255.255.254
172.16.0.1 through 172.31.255.254
192.168.1.1 through 192.168.255.254
Ip addresses can't have numbers greater than 255.
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8
Q

How many hosts are supported in subnet with a network ID of 192.168.1.128/26?

30
32
62
64

A

62

The formula is 2h -2 where the h is the number of bits used in the host ID. Since 26 bits are used in the network ID, 6 bits are left for the host ID (32-26=6) and 26-2=62.

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9
Q

The following two classless IP addresses have the same network ID?
192.168.1.105/26 and 192.168.1.136/26

True
False

A

False

The first IP address has a subnet mask of 255.255.255.192 and a network ID of 192.168.1.64.
The second IP address has a subnet mask of 255.255.255.192 and a network ID of 192.168.1.128.

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10
Q
A computer is unable to communicate with other computers on the network. You use ipconfig and see the following information?
IP Address: 169.254.5.7
Subnet Mask: 255.255.0.0
Default Gateway: Blank
DNS Server: Blank

A DHCP Server can’t be reached.
The Default Gateway needs to be manually configured
The DNS Server IP Address needs to be manually configured.
NONE of the Above

A

A DHCP Server can’t be reached.

An address starting with 169.254 is an APIPA address.
An APIPA address is assigned to DHCP clients when a DHCP server can’t be reached.
Manually configuring the Gateway or DNS Server IP address isn’t needed for a DHCP Client.

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