Networking & IPv6

Question 1

In a /27 subnet and a Subnet Mask of 255.255.255.224, the customer has how many Public Routable IP addresses?

Answer 1

29 Public Routable IP Addresses

Question 1

How many times in an IPv6 address can you use the double colon to omit zeroes?

Answer 1

Only once

Question 2

In a /30 subnet and a Subnet Mask of 255.255.255.252, the customer has how many Public Routable IP addresses?

Answer 2

1 Public Routable IP Address

Question 3

In a /29 subnet and a Subnet Mask of 255.255.255.248, the customer has how many Public Routable IP addresses?

Answer 3

5 Public Routable IP Addresses

Question 3

How many addresses is IPv6 capable of?

Answer 3

Approximately 3.4E+11 or 340 undecillion

Question 5

An IP address in the range of 128-191.X.X.X is what class of IP address?

Answer 5

Class B Public

Question 6

Comcast is migrating to this version of IP which will allow for nearly unlimited IP addresses.

Answer 6

IPv6

Question 7

192.168.X.X is an example of what class of IP address?

Answer 7

Class C Private

Question 8

What types of addresses does IPv6 support?

Answer 8

Unicast addresses and multicast addresses

Question 9

Where can a customer go to see what their IPv6 address is?

Answer 9

www.comcast6.net

Question 10

What does DHCP stand for?

Answer 10

Dynamic Host Configuration Protocol

Question 12

10.1.X.X is an example of what class of IP address?

Answer 12

Class A Private

Question 13

An IP address in the range of 192-223.X.X.X is what class of IP address?

Answer 13

Class C Public

Question 13

In a /28 subnet and a Subnet Mask of 255.255.255.240, the customer has how many Public Routable IP addresses?

Answer 13

13 Public Routable IP Addresses

Question 14

What are the two currently used COMCAST DNS’s?

Answer 14

75.75.75.75 and 75.75.76.76

Question 16

What is the simplified version of the following IPv6 address? FE80:CD00:0000:0000:0000:0000:211E:729C

Answer 16

FE80:CD00::211E:729C

Question 17

In IPv6, what is Duplicate Address Detection?

Answer 17

It is a mechanism that detects duplicate addresses on a subnet

Question 18

What are the advantages of IPv6?

Answer 18

Simplified header format for efficient packet handling

Larger payload for increased throughput and transport efficiency

Hierarchical network architecture for routing efficiency

Support for widely deployed routing protocols (OSPF, BGP, etc.)

Autoconfiguration and plug-and-play support

Elimination of need for network address translation (NAT) and application layered gateway (ALG)

Increased number of multicast addresses

Question 20

How many bits is the address field for IPv6?

Answer 20

128

Question 21

An IP address in the range of: 1-127.X.X.X is what class of IP address?

Answer 21

Class A Public

Question 22

Comcast is continuing to provide an IPv4 address to each customer and is now additionally providing IPv6 addresses. What is this approach referred to?

Answer 22

Dual Stack Mode

Question 23

What is dual stack mode?

Answer 23

When IPv4 and IPv6 run on the same network infrastructure

Question 24

One way technicians can tell if an IPv6 compatible modem is having an issue related to IPv6 and is ranging is because “this” modem light will continue to blink.

Answer 24

Online

Question 25

What is the loopback address for IPv6?

Answer 25

0000:0000:0000:0000:0000:0000:0000:0001

or ::1

Question 26

This tool in the National CMTS Operations Portal can be used by a field technician to verify a CMTS is set for IPv6, then switch the cable-mac that the modem is on to IPv4.

Answer 26

IPv6 to IPv4 MAC Switcher

Question 27

How are IPv6 addresses written or expressed?

Answer 27

In 8 groups of 4 hexadecimal digits separated by colons

Question 28

Why don’t you need a traditional subnet mask for IPv6?

Answer 28

The subnet ID is built into the address