Module 8: Network Layer Flashcards
What is the purpose of configuring a unique IP address for end devices on a network?
The purpose of configuring a unique IP address for end devices on a network is to identify them on the network.
What is the process of encapsulation in the network layer and what information is added during this process?
During encapsulation in the network layer, the protocol data unit (PDU) from the transport layer is converted into a packet and IP header information is added, such as the IP addresses of the source and destination hosts. This process is performed by the source of the IP packet.
What is the role of a router in the network layer?
The role of a router in the network layer is to select the best path and direct packets toward the destination host in a process known as routing. A packet may cross many routers before reaching the destination host, and each router a packet crosses is called a hop.
What is the advantage of encapsulating data layer by layer in networking?
Answer: Encapsulating data layer by layer in networking enables the services at the different layers to develop and scale without affecting the other layers. This allows for easier maintenance and updates to specific layers, as well as the ability to add new layers to the protocol stack without disrupting existing layers.
Why is IP considered unreliable, and what is the relationship between IP and connectionless communication?
IP is considered unreliable because it does not guarantee packet delivery. The packets sent through IP are delivered in a best effort manner, meaning that the network will attempt to deliver the packets, but it is not guaranteed. This is because IP uses connectionless communication, where there is no connection established before sending data packets.
What is fragmentation in relation to IP packets, and why is the delivery method of IP considered best effort?
Fragmentation is the process of breaking up a large IP packet into smaller fragments when it is forwarded from one medium to another with a smaller maximum transmission unit (MTU). This allows the packet to be transmitted across the network without being lost or dropped.
What are the three major issues with IPv4?
The three major issues with IPv4 are address depletion, lack of end-to-end connectivity, and increased network complexity.
