Week 6

Question 1

What does multicast mean?

Answer 1

Sending a packet to a multicast address group

Question 2

What does unicast mean?

Answer 2

Sending a packet to 1 destination IP address

Question 3

What does broadcast mean?

Answer 3

Sending a packet to all destination IP addresses (other than itself)

Question 4

What is prefix length in regards to a subnet mask?

Answer 4

The number of bits set to 1 in the subnet mask

Question 5

With a subnet mask of 255.0.0.0, what would the prefix length be? How about a subnet mask of 255.255.255.0?

Answer 5

/8 and /24

Question 6

How does “slash notation” work? Explain with this example: 11111111.11111111.00000000.00000000

Answer 6

Count the number of bits in the subnet mask and prepend it with a slash. The example is /16

Question 7

IPv4 host addresses and IPv4 network addresses differ. How is the host address used to create the network address?

Answer 7

The host address is combined with the subnet mask using a logical AND operator.

Question 8

IPv4 host address: 1100 0000 1010 1000 0000 1010 0000 1010
Subnet mask: 1111 1111 1111 1111 1111 1111 0000 0000

What is the IPv4 network address?

Answer 8

1100 0000 1010 1000 0000 1010 0000 00000

Question 9

What are the 3 types of IP addresses used in networking?

Answer 9

Network address, host address, broadcast address

Question 10

The first 3 parts of an IP address is referred to as the _______ portion, and final part is referred to as the ____ portion

Answer 10

network portion, host portion

Question 11

If my host portion is 11111111 (255) the host bits are all _. If my host portion is 00000000 (0) all the host bits are _.

Answer 11

1, 0

Question 12

T/F - RFC 1918 defines a private address range that is used as a common block to assign IPv4 addresses internally

Answer 12

True

Question 13

Are private IPv4 addresses unique?

Answer 13

No they are not. They can be used internally within any network.

Question 14

What translates private IPv4 addresses to public ones? Where is it typically enabled?

Answer 14

NAT - Network address translation. Typically enabled on the edge router connecting to the internet.

Question 15

What are loopback addresses used for? What IP is commonly identified as a loopback address?

Answer 15

Used by the host to determine if TCP/IP is operational. Commonly identified as 127.0.0.1.

Question 16

T/F - 127.0.0.1 is the only loopback address

Answer 16

False. Can range from 127.0.0.1 to 127.255.255.255

Question 17

169.254.0.0 /16 (169.254.0.1 to 169.254.255.254)

What type of special use IPv4 address is this?

Answer 17

This is a link-local address.