Final Exam - IPv4 Review Flashcards
1 How many bits are in an IPv4 address?
32 bit
2 How is a dotted decimal IPv4 address organized?
4 8 bit number divided by a .
- 1.1.1
- 5.5.5
What are the minimum and maximum values in an IPv4 octet?
Min is 0
max is 255
What are the minimum and maximum values for of the first octets for Classes A
- to 126.
What are the minimum and maximum values for of the first octets for Classes, B,
- to 191.
What are the minimum and maximum values for of the first octets for Classes , C,
- to 223.
What are the minimum and maximum values for of the first octets for Classes C, D,
First octet value range from 224 to 239
Range: 224.0.0.0 to 239.255.255.255
What are the minimum and maximum values for of the first octets for Classes E?
First octet value range from 240 to 255
Range: 240.0.0.0 to 255.255.255.255
What are the High Order Bits in the first octet for Classes A, B, C, D, & E?
Table 3.7. Address Class and Range
Class, High-Order Bits, 1st Octet Range
A, 0, 1–126
B, 10, 128–191
C, 110, 192–223
D, 1110, 224–239
E, 11110, 240–255
What is the purpose of each class of IPv4 addresses?
to divide networks based on need of networks and hosts.
Class A: large number of hosts and small number of networks needed.
Class C: small number of hosts but large number of networks needed.
Class B: somewhere in the middle / balance of number networks and hosts needed.
Class D: multicast
Clkass E: experimental
What is the default subnet mask for a Class A, IPv4 address?
255.0.0.0
What is the default subnet mask for a Class B, IPv4 address?
255.255.0.0
What is the default subnet mask for a Class C IPv4 address?
255.255.255.0
How many bits are in a binary subnet mask?
32 bits
What is the purpose of a subnet mask?
What is the purpose of subnet mask?
A subnet mask is used to divide an IP address into two parts. One part identifies the host (computer), the other part identifies the network to which it belongs.
What is the formula for calculating subnets?
To calculate the number of possible subnets, use the formula 2n, where n equals the number of host bits borrowed. For example, if three host bits are borrowed, then n=3. 23 = 8, so eight subnets are possible if three host bits are borrowed.
What is the formula for calculating hosts?
Remember that the formula for determining the number of hosts a network supports is 2n-2, where n is the number of bits used for the host.
Identify ranges for Private IPv4 addresses?
Class A
10.0.0.0 – 10.255.255.255 (16,777,216 IP addresses)
Identify ranges for Private IPv4 addresses?
Class B
172.16.0.0 – 172.31.255.255 (1,048,576 IP addresses)
Identify ranges for Private IPv4 addresses?
Class C
192.168.0.0 – 192.168.255.255 (65,536 IP addresses)
Why were Private IPv4 addresses identified?
Private IP address spaces were originally defined to assist in delaying IPv4 address exhaustion. IP packets originating from or addressed to a private IP address cannot be routed through the public Internet.
What are 2 uses for the IPv4 address 127.0.0.1?
Loopback
troubshooting
True or False: All devices: peripherals, hosts and router interfaces on the same subnet have
the same Subnet ID and Subnet Mask?
true
What is a network prefix?
the network portion of the address. The host is the other part
