Page 171 - Computer_Science_F5

Computer Science Payload length Source address Hop limit (vii) Source address: Represents the IPv6
address of the packet’s source.
Version
Flow label
Traffic class
(viii)Destination address: Represents
Next header
the IPv6 address of the packet’s
destination.
FOR ONLINE READING ONLY
Destination address Overall, the IPv6 header format is more
streamlined and efficient compared to
IPv4, providing improved support for
Figure 3.19: IPv6 header format modern networking requirements such as
security, mobility, and quality of service.
The IPv6 header format includes various
fields, each serving a specific purpose:
Activity 3.7:
(i) Version: Specifies the version of the
IP protocol being used, which is IPv6 Exploring the network layer with
in this case. simulation
(ii) Traffic class: Similar to the Type Aim:
of Service (ToS) field in IPv4, the To deepen understanding of the network
Traffic Class field in IPv6 allows for layer through simulation, focusing on
the classification and prioritization end-to-end packet delivery, network
of packets. layer protocols, and the operational
(iii) Flow label: This field is used to role of routers.
identify packets belonging to the Materials:
same flow, facilitating quality Internet access; Computer or laptop;
of service (QoS) and flow-based Simulation software (Such as Cisco
routing. Packet Tracer, GNS3); Web browser;
(iv) Payload length: Indicates the length Text editor or word processing
of the data payload in the packet, software; Diagramming tools (Such
excluding the header. as Lucidchart, Microsoft Visio)

(v) Next header: Specifies the type of the Instructions:
next header in the packet, allowing Use the Internet and simulation tools
for the chaining of multiple headers. to complete the following tasks:
(vi) Hop limit: Similar to the Time to 1. Simulate end-to-end delivery
Live (TTL) field in IPv4, the hop (a) Use network simulation
limit field in IPv6 specifies the software (Such as Cisco Packet
maximum number of hops or routers Tracer, GNS3) to simulate how
that a packet can traverse before the network layer enables end-
being discarded. to-end delivery of packets

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for Advanced Secondary Schools

Computer Science Form 5.indd 162 23/07/2024 12:33