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Computer Networks Lecture 5: Network Layer

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Questions and Answers

What is the primary function of the IP protocol?

Provides error-checking and correction of datagrams
Provides connection-oriented, reliable delivery of packets
Provides routing and forwarding of packets
Provides connectionless, best-effort delivery of datagrams (correct)

How do IP addresses differ from physical addresses?

IP addresses are logical addresses, while physical addresses are hardware addresses (correct)
IP addresses are assigned by the system administrator, while physical addresses are set by the device manufacturer
IP addresses are used for routing, while physical addresses are used for switching
IP addresses are 32-bit numbers, while physical addresses are 48-bit

What is the purpose of DHCP?

To dynamically assign IP addresses to devices on a network (correct)
To assign IP addresses to devices on a local network only
To assign IP addresses to devices on a wide area network only
To assign static IP addresses to devices on a network

What is the first step in the DHCP process?

The host broadcasts a 'DHCP discover' message (A) Signup and view all the answers

What is the primary advantage of using DHCP?

It allows devices to dynamically obtain their IP addresses (D) Signup and view all the answers

What is included in the DHCP ACK message sent by the DHCP server?

Client's IP address, IP address of first-hop router for client, and IP address of DNS server (A) Signup and view all the answers

What is one of the benefits of IPv6 headers?

They are simplified and efficient (D) Signup and view all the answers

What is the main advantage of IPv6 over IPv4?

IPv6 has a larger address space than IPv4 (C) Signup and view all the answers

What is site multihoming in IPv6?

A site having connections to multiple ISPs (A) Signup and view all the answers

What is the size of an IPv6 address?

128 bits (C) Signup and view all the answers

What is one of the benefits of IPv6's auto configuration of addresses?

It allows for simpler address hierarchy levels (D) Signup and view all the answers

What is the primary benefit of IPsec in IP network security?

Improved privacy and security (C) Signup and view all the answers

What is the main difference between IPsec's transport mode and tunnel mode?

Transport mode only protects the transport layer, while tunnel mode protects the entire packet (B) Signup and view all the answers

What is the primary function of ICMP in IP networks?

To report errors and provide feedback on specific conditions (A) Signup and view all the answers

What is the main advantage of Mobile IPv6?

It allows an IPv6 node to change its location on an IPv6 network and still maintain its existing connections (C) Signup and view all the answers

What is carried on IP packets in ICMP?

Error messages and control messages (B) Signup and view all the answers

What is the collection of protocols designed by the IETF to provide security for a packet at the network level?

IPSec (D) Signup and view all the answers

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