Computer Networking Week 1 Basics

Questions and Answers

Which of the following is an example of a network layer (layer 3) protocol?

UDP

TCP

Ethernet

IP (correct)

What's the difference between a client and a server?

A client requests data, and a server responds to that request.

Which of the following are examples of layers of our five-layer network model? (Check all that apply)

The transport layer (correct)

The application layer (correct)

The presentation layer

The physical layer (correct)

Which of the following statements accurately describe the differences between a hub and a switch? (Check all that apply)

A hub is a physical layer device, and a switch is a data link layer device Signup and view all the answers

What does LAN stand for?

Local area network Signup and view all the answers

What's a router?

A device that knows how to forward data between independent networks. Signup and view all the answers

What is the type of modulation used by twisted pair cable computer networks known as?

Line coding Signup and view all the answers

What's the difference between full and half duplex?

Full duplex allows communications in two directions at the same time; half duplex means that only one side can communicate at a time. Signup and view all the answers

How many octets are there in a MAC address?

6; A MAC address is a 48-bit number consisting of 6 octets. Signup and view all the answers

What address is used for Ethernet broadcasts?

FF:FF:FF:FF:FF:FF Signup and view all the answers

What is a cyclical redundancy check?

A mathematical calculation used to ensure that all data arrived intact. Signup and view all the answers

A device that knows how to forward traffic between independent networks is known as a ____.

router Signup and view all the answers

MAC address stands for ____ address.

media access control Signup and view all the answers

Something that requests data from a server is known as a ____.

client Signup and view all the answers

When an electrical pulse on one wire is accidentally detected on another nearby wire, this is known as _____.

cross talk Signup and view all the answers

A defined set of standards that computers must follow in order to communicate properly is known as a _____. (Select one)

protocol Signup and view all the answers

What is the fifth layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Application Signup and view all the answers

Which layer in the Transmission Control Protocol/Internet Protocol (TCP/IP) model is responsible for delivering data between two nodes? (Select one)

Network Signup and view all the answers

The Ethernet protocol functions at which layer of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Data link Signup and view all the answers

What type of network segment is being used when multiple systems try to send data at the same time and electrical pulses sent across the cable interfere with each other?

Collision Domain Signup and view all the answers

What device forwards data and operates at layer three of the Transmission Control Protocol/Internet Protocol (TCP/IP) model?

Router Signup and view all the answers

How many wires are in a standard Category 6 cable?

8; A standard Cat6 cable has 8 wires that consist of four twisted pairs inside of a single jacket. Signup and view all the answers

Select the device that will have the most network ports: Desktop, Server, Switch, Laptop?

Switch Signup and view all the answers

What is used to determine when the communications channels are clear and when a device is free to transmit data?

Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Signup and view all the answers

You need to identify the manufacturer of a network interface. Where will you look for this information?

The first three octets of a MAC address are known as the Organizationally Unique Identifier (OUI). Signup and view all the answers

What section in an Ethernet frame will you find a Virtual Local Area Network (VLAN) header?

EtherType field Signup and view all the answers

Where is the Start Frame Delimiter (SFD) found in an Ethernet frame?

The last byte of the preamble Signup and view all the answers

Study Notes

Networking Protocols and Layers

IP (Internet Protocol) is the primary network layer (Layer 3) protocol.
Client initiates requests for data, while server provides responses to these requests.
Five-layer network model includes the physical layer, transport layer, and application layer, among others.

Hubs vs. Switches

Hubs create larger collision domains due to their lack of intelligent data handling.
Hubs operate at the physical layer; switches function at the data link layer, storing device connections.

Networking Definitions

LAN stands for Local Area Network.
Routers forward data between distinct networks.
Line coding refers to the modulation technique used in twisted pair cable networks.

Communication Modes

Full duplex allows simultaneous two-way communication; half duplex permits one-way communication at a time.

Addressing and Identification

MAC addresses consist of 6 octets (48-bit numbers).
Ethernet broadcasts utilize the address FF:FF:FF:FF:FF:FF.
A cyclical redundancy check verifies data integrity by ensuring the absence of corruption.
MAC stands for media access control; it identifies network interface manufacturers via the first three octets known as the Organizationally Unique Identifier (OUI).

Network Characteristics

Crosstalk occurs when an electrical pulse migrates from one wire to a nearby wire, mitigated by twisting wires in cables.
Protocols define standards for communication among computers.
The application layer is the fifth layer of the TCP/IP model.

Data Transmission

Both collision domains and CSMA/CD (Carrier Sense Multiple Access with Collision Detection) are essential for managing communication channels and avoiding data collisions.
A collision domain restricts simultaneous communication to one device.

Ethernet Frame Structure

The EtherType field in an Ethernet frame may contain a VLAN (Virtual Local Area Network) header.
The Start Frame Delimiter (SFD) is located in the last byte of the preamble of an Ethernet frame, indicating the start of frame data.

Cable Specifications

Standard Category 6 (Cat6) cables incorporate 8 wires arranged into four twisted pairs.
Switches, designed to connect multiple devices, possess the highest number of network ports compared to desktops, servers, and laptops.

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Description

This quiz covers the foundational concepts of computer networking, focusing on key protocols and the roles of clients and servers. Great for beginners wanting to grasp the essentials of networking. Test your understanding with these flashcards!