Computer Networking Fundamentals

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Questions and Answers

Which of the following is the main responsibility of the Application Layer?

Enables communication between source and destination hosts through protocols (correct)

Controls data link layer operations

Provides error detection and correction for data transfer

Establishes routing paths for data packets

In a client-server model, which of the following statements is true?

The server and client communicate without the need for IP addresses.

Both the client and server share the same functions in processing and requesting data.

The client and server do not communicate over the same network layer.

The client sends requests for services, while the server provides the services. (correct)

What is the role of DNS in networking?

To secure communication between servers and clients

To translate IP addresses into hostnames

To convert human-readable domain names into IP addresses (correct)

To monitor and maintain the flow of network traffic

What happens when a DNS server cannot resolve a requested name within its database?

The DNS server forwards the request to another DNS server for resolution. Signup and view all the answers

What is the root-level domain in DNS?

A level that includes the domain names like .com, .net, .org, .edu Signup and view all the answers

When an IPv4 DHCP client connects to the network, what is the first message it sends?

DHCP Discover Signup and view all the answers

Which DHCP message does the server send in response to a DHCP Discover message?

DHCP Offer Signup and view all the answers

After receiving a DHCP Offer message, what does the client send back to the server?

DHCP Request Signup and view all the answers

What is the purpose of a DHCP Acknowledgment (DHCP ACK) message?

To confirm the IP address lease to the cient Signup and view all the answers

Which of the following best describes the difference between DHCP for IPv4 and IPv6?

DHCP for IPv6 does not provide a default gateway unlike DHCP for IPv4. Signup and view all the answers

In FTP, which port is used for control traffic between the client and server?

21 Signup and view all the answers

How does FTP handle data transfer between the client and server?

FTP establishes two separate connections: one for control (port 21) and one for data (port 20). Signup and view all the answers

What is the main purpose of the Server Message Block (SMB) protocol?

To enable file sharing between networked devices Signup and view all the answers

Which of the following is true about SMB compared to FTP?

SMB allows clients to access shared resources like network drives as though they are local to the client. Signup and view all the answers

Which of the following is NOT a function of the Application Layer?

Converting data into packets for transmission Signup and view all the answers

What is an important feature of the IMAP protocol compared to POP?

IMAP allows emails to romain on the server, while POP downloads and deletes them from the server. Signup and view all the answers

What does the "A" record in DNS represent?

The IPv4 address for a hostname Signup and view all the answers

When using NS lookup, if a DNS request times out, what does it indicate?

The DNS server could not resolve the name, and the client must retry. Signup and view all the answers

In DNS, what is the purpose of the "authority" section in a DNS response?

It indicates the authoritative name servers for the queried domain. Signup and view all the answers

In the DNS hierarchy, what does the term "second-level domain" refer to?

The domain name directly beneath a top-level domain, such as "cisco.com" or "google.com". Signup and view all the answers

Study Notes

Application Layer Responsibilities

Enables communication between source and destination hosts through protocols.

Client-Server Model

The client sends requests for services, while the server provides the services.

DNS Role in Networking

Converts human-readable domain names into IP addresses.

DNS Server Resolution Failure

Forwards the request to another DNS server if the name isn't found locally.

Root-Level Domain in DNS

Includes domain names like .com, .net, .org, .edu.

DHCP Client Initial Message

Sends a DHCP Discover message.

Server Response to DHCP Discover

Sends a DHCP Offer message.

Client Response to DHCP Offer

Sends a DHCP Request.

DHCP Acknowledgment (DHCP ACK) Purpose

Confirms the IP address lease to the client.

DHCP IPv4 vs IPv6

DHCP for IPv6 doesn't provide a default gateway like DHCP for IPv4.

FTP Control Port

Port 21.

FTP Data Transfer Handling

Uses two separate connections: one for control (port 21) and one for data (port 20).

Server Message Block (SMB) Purpose

Enables file sharing between networked devices.

SMB vs FTP

SMB allows clients to access shared resources like network drives as though they are local.

Application Layer Function Exclusions

Converting data into packets for transmission isn't an application layer function.

IMAP vs POP

IMAP keeps emails on the server; POP downloads and deletes them.

DNS A Record

Represents the IPv4 address for a hostname.

NS Lookup Timeout

Indicates the DNS server couldn't resolve the name.

DNS Authority Section

Indicates the authoritative name servers for the queried domain.

Second-Level Domain

The domain name directly beneath a top-level domain, such as "cisco.com" or "google.com".

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Description

This quiz covers essential concepts in computer networking, including the application layer's responsibilities, client-server model, DNS functions, and DHCP processes. It is designed for learners looking to understand the basics of how networks operate and communicate.