CCST - Cisco Certified Support Technician IPv4 vs. IPv6 Addressing Questions and Answers

Question 1

A network technician is configuring a new device on an IPv6-enabled network. The device needs to automatically configure its own IP address without the use of a DHCP server. Which IPv6 feature allows for this?

Accepted Answer

SLAAC

Answer

Stateless Address Autoconfiguration (SLAAC) is a key feature of IPv6 that allows a device to automatically generate its own unique IPv6 address by combining the network prefix provided by a router with its own interface identifier (often derived from the MAC address). This process does not require a stateful server like DHCP.

Question 2

What is the primary reason for the development and adoption of IPv6 over IPv4?

Accepted Answer

The exhaustion of the 32-bit IPv4 address space.

Answer

The primary motivation for creating IPv6 was the depletion of the available IPv4 address pool. IPv4 uses a 32-bit address, allowing for approximately 4.3 billion unique addresses, which is insufficient for the growing number of internet-connected devices. IPv6 uses a 128-bit address, providing a vastly larger address space.

Question 3

A support technician is examining IP packet headers and notices a significant difference between IPv4 and IPv6. Which of the following fields is present in an IPv4 header but has been removed from the main IPv6 header to improve efficiency?

Accepted Answer

Header Checksum

Answer

The IPv6 header was simplified for more efficient processing by routers. One of the fields removed from the main IPv6 header is the Header Checksum. Error checking is now expected to be handled by upper-layer protocols (like TCP/UDP) and the link layer, reducing the processing load on routers.

Question 4

How are IPv6 addresses typically represented in human-readable format?

Accepted Answer

Eight hexadecimal numbers separated by colons.

Answer

IPv6 addresses are 128 bits long and are written as eight groups of four hexadecimal digits, with the groups separated by colons. For example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334.

Question 5

A company is transitioning to an IPv6-only internal network but still needs to allow its users to access services on the IPv4 internet. Which technology is specifically designed to facilitate this communication between IPv6 and IPv4 networks?

Accepted Answer

NAT64

Answer

NAT64 is a translation mechanism that allows IPv6-only clients to communicate with IPv4-only servers. A NAT64 gateway translates IPv6 packets into IPv4 packets and vice versa, enabling compatibility between the two protocols during the transition period.

(CCST) Cisco Certified Support Technician Practice Test

(CCST) Cisco Certified Support Technician Practice Test

CCST - Cisco Certified Support Technician IPv4 vs. IPv6 Addressing Questions and Answers