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CCNA 200-120 Training3.2 Identify the appropriate IPv6 addressing scheme to satisfy addressing requirements in a LAN/WAN environment

Jose Luis Flores / Amel Walkinshaw

Aug, 2015

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3.0 IP Addressing (IPv4/IPv6)

3.2 Identify the appropriate IPv6 addressing scheme to satisfy addressing requirements in a LAN/WAN environment

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3.0 IP Addressing (IPv4/IPv6)

Facts:

• The rapid growth of the Internet and the exhaustion of the IPv4 address space

• The need for simpler autoconfiguration and renumbering of network devices

• A requirement for security at the IP level

• A need for better support for real-time delivery of data—also called quality of service (QoS)

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3.0 IP Addressing (IPv4/IPv6)

Goals:

•How to write and interpret unabbreviated 32-digit IPv6 addresses•How to abbreviate IPv6 addresses, and how to interpret abbreviated addresses•How to interpret the IPv6 prefix length mask•How to find the IPv6 prefix (subnet ID), based on an address and prefix length mask

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3.0 IP Addressing (IPv4/IPv6)

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3.0 IP Addressing (IPv4/IPv6)

Hex Binary Hex Binary

0 0000 8 1000

1 0001 9 1001

2 0010 A 1010

3 0011 B 1011

4 0100 C 1100

5 0101 D 1101

6 0110 E 1110

7 0111 F 1111

Hexadecimal/Binary Conversion Chart

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3.0 IP Addressing (IPv4/IPv6)

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IPv4 Packet Header Format

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3.0 IP Addressing (IPv4/IPv6)

IPv6 Packet Header Format

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3.0 IP Addressing (IPv4/IPv6)

Basic IPv6 Packet Header Fields

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1. Inside each quartet of four hex digits, remove the leading 0s (0s on the left side of the quartet) in the three positions on the left. (Note: at this step, a quartet of 0000 will leave a single 0.)

2. Find any string of two or more consecutive quartets of all hex 0s, and replace that set of quartets with double colon (::). The :: means “two or more quartets of all 0s.” However, you can only use :: once in a single address, because otherwise the exact IPv6 might not be clear.

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FE00:0000:0000:0001:0000:0000:0000:0056

FE00:0:0:1:0:0:0:56

FE00:0:0:1::56

FE:0:0:1::56

FE00::1::56

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3.0 IP Addressing (IPv4/IPv6)

Expanding Abbreviated IPv6 Addresses

1. In each quartet, add leading 0s as needed until the quartet has four hex digits.

2. If a double colon (::) exists, count the quartets currently shown; the total should be less than 8. Replace the :: with multiple quartets of 0000 so that eight total quartets exist.

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3.0 IP Addressing (IPv4/IPv6)

Compressed IPv6 Address Formats

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3.0 IP Addressing (IPv4/IPv6)

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3.0 IP Addressing (IPv4/IPv6)

Which IPv6 address is the equivalent of the IPv4 interface loopback address 127. 0.0. 1?

A. ::1B. ::C. 2000::/3D. 0::/10

Explanation:In IPv6 the loopback address is written as, This is a 128bit number, with the first 127 bits being '0' and the 128th bit being '1'. It's just a single address, so could also be written as ::1/128.

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3.0 IP Addressing (IPv4/IPv6)

What are three features of the IPv6 protocol? (Choose three.)

A. optional IPsecB. autoconfigurationC. no broadcastsD. complicated headerE. plug-and-playF. checksums

Explanation:An important feature of IPv6 is that it allows plug and play option to the network devices by allowing them to configure themselves independently. It is possible to plug a node into an IPv6 network without requiring any human intervention. This feature was critical to allow network connectivity to an increasing number of mobile devices. This is accomplished by autoconfiguration. IPv6 does not implement traditional IP broadcast, i. e. the transmission of a packet to all hosts on the attached link using a special broadcast address, and therefore does not define broadcast addresses. In IPv6, the same result can be achieved by sending a packet to the link-local all nodes multicast group at address ff02::1, which is analogous to IPv4 multicast to address 224.0.0.1.

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3.0 IP Addressing (IPv4/IPv6)

What is known as "one-to-nearest" addressing in IPv6?

A. global unicastB. anycastC. multicastD. unspecified address

Explanation:IPv6 Anycast addresses are used for one-to-nearest communication, meaning an Anycast address is used by a device to send data to one specific recipient (interface) that is the closest out of a group of recipients (interfaces).

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3.0 IP Addressing (IPv4/IPv6)

Which two of these statements are true of IPv6 address representation? (Choose two.)

A. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.B. A single interface may be assigned multiple IPv6 addresses of any type.C. Every IPv6 interface contains at least one loopback address.D. The first 64 bits represent the dynamically created interface ID.E. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

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Bibliography

• http://www.examcollection.com/certification-training/ccna-ipv6-addressing-scheme-in-lan-wan-environment.html• http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-3s/ip6b-xe-3s-book/ip6-add-basic-conn-xe.html• http://www.cisco.com/c/dam/en/us/solutions/collateral/enterprise/design-zone-government/sbaBN_IPv6addrG.pdf• http://www.cisco.com/web/solutions/trends/ipv6/index.html• http://www.ciscopress.com/articles/article.asp?p=2033341&seqNum=2• https://4sysops.com/archives/ipv6-part-1-get-started-now/

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Q&A