Networking Flashcards Module 1-3

Questions and Answers

What network feature would allow an employee to gain secure remote access to a company network?

WISP

Router

Extranet

VPN (correct)

In which scenario would the use of a WISP be recommended?

A farm in a rural area without wired broadband access (correct)

An office in a business park

A city with extensive wired broadband networks

A residential area with cable internet

Which device performs the function of determining the path that messages should take through internetworks?

Router

Which term refers to a network that provides secure access to the corporate offices by suppliers, customers, and collaborators?

Extranet Signup and view all the answers

What functionality is provided by DHCP?

Automatic assignment of an IP address to each host Signup and view all the answers

Which memory location on a Cisco router or switch stores the startup configuration file?

NVRAM Signup and view all the answers

What is the function of the shell in an OS?

It interfaces between the users and the kernel. Signup and view all the answers

Which type of access is secured on a Cisco router or switch with the enable secret command?

Privileged EXEC Signup and view all the answers

What is the default SVI on a Cisco switch?

VLAN1 Signup and view all the answers

What is done to an IP packet before it is transmitted over the physical medium?

It is encapsulated in a Layer 2 frame. Signup and view all the answers

A web client is sending a request for a webpage to a web server. From the perspective of the client, what is the correct order of the protocol stack that is used to prepare the request for transmission?

HTTP, TCP, IP, Ethernet Signup and view all the answers

What are the benefits of using a layered network model?

<ol> <li>Assists in protocol design. 2. Fosters competition between vendors. 3. Prevents a technology that functions at one layer from affecting any other layer. 4. Provides a common language for describing network functionality. 5. Helps in visualizing the interaction between each layer and protocols.</li> </ol> Signup and view all the answers

What is the purpose of protocols in data communications?

Providing the rules required for a specific type of communication to occur. Signup and view all the answers

Which logical address is used for delivery of data to a remote network?

Destination IP address Signup and view all the answers

What is the general term that is used to describe a piece of data at any layer of a networking model?

Protocol data unit (PDU) Signup and view all the answers

Match segment, frame, and packet to their corresponding OSI layers.

Segment = Transport Layer Packet = Network Layer Frame = Data Link Layer Signup and view all the answers

Which two protocols function at the internet layer? (Choose two.)

IP Signup and view all the answers

Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?

Transport layer Signup and view all the answers

Which type of communication will send a message to a group of host destinations simultaneously?

Multicast Signup and view all the answers

In computer communication, what is the purpose of message encoding?

To convert information to the appropriate form for transmission. Signup and view all the answers

Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?

Segments are sent from the transport layer to the internet layer. Signup and view all the answers

What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)

FTP Signup and view all the answers

Which name is assigned to the transport layer PDU?

Segment Signup and view all the answers

When IPv4 addressing is manually configured on a web server, which property of the IPv4 configuration identifies the network and host portion for an IPv4 address?

Subnet mask Signup and view all the answers

At which OSI layer is a source IP address added to a PDU during the encapsulation process?

Network Layer Signup and view all the answers

At which OSI layer is a destination port number added to a PDU during the encapsulation process?

Transport Layer Signup and view all the answers

At which OSI layer is data added to a PDU during the encapsulation process?

Application Layer Signup and view all the answers

At which OSI layer is a source MAC address added to a PDU during the encapsulation process?

Data Link Layer Signup and view all the answers

Which two statements correctly identify the addressing that ServerB will generate in the process? (Choose two)

ServerB will generate a frame with the destination MAC address of RouterB. Signup and view all the answers

From the perspective of a web client receiving a response for a web page from a web server, what is the correct order of the protocol stack that is used to decode the received transmission?

Ethernet, IP, TCP, HTTP Signup and view all the answers

What layer of the OSI model deals with how messages are exchanged between the source and the destination?

All layers Signup and view all the answers

Why would a Layer 2 switch need an IP address?

To enable the switch to be managed remotely. Signup and view all the answers

What term describes a network where one computer can be both client and server?

Peer-to-peer Signup and view all the answers

What term describes a computing model where server software runs on dedicated computers?

Client/server Signup and view all the answers

What term describes a technology that allows devices to connect to the LAN using an electrical outlet?

Powerline networking Signup and view all the answers

Study Notes

Remote Access and Networking Concepts

VPN (Virtual Private Network): Provides secure remote access to an organization's network for employees.
WISP (Wireless Internet Service Provider): Recommended for rural areas lacking wired broadband access; utilizes a dish or antenna to connect wirelessly to a WISP transmitter.
Router: Device that determines the optimal path for messages traveling through internetworks.

Networking Definitions

Extranet: A network that allows secure access to corporate resources for suppliers, customers, and collaborators, distinct from intranet (internal network) and internet (global network).
DHCP (Dynamic Host Configuration Protocol): Automatically assigns IP addresses to hosts in a network.

Cisco Router and Switch Configurations

NVRAM: Nonvolatile memory where the startup configuration file of a Cisco router or switch is stored.
Shell in OS: Interface between the user and the kernel, allowing user commands to communicate with the hardware.
Enable Secret Command: Secures privileged EXEC mode access on a Cisco router or switch.
Default SVI (Switch Virtual Interface): VLAN1 is the default SVI on Cisco switches, enabling remote access over IP.

Data Transmission and Protocols

IP Packet Encapsulation: IP packets are encapsulated in data link frames at Layer 2 before transmission over the physical medium.
Protocol Stack Order for Requests: For a web client sending a webpage request, the order is HTTP, TCP, IP, Ethernet.
Benefits of Layered Network Models: Includes clear protocol design, competition between vendors, and prevents issues in one layer from affecting others.

Communication and Addressing

Destination IP Address: Used for delivering data to remote networks; differs from destination MAC address for local networks.
Protocol Data Units (PDU): Different terms used for data at various layers—segment (transport), packet (network), frame (data link).

OSI Model Insights

Transport Layer: Responsible for segmenting and reassembling data for communication between devices.
Multicast Communication: Allows messages to be sent to a specific group of hosts, contrasting with unicast (one-to-one) and broadcast (one-to-all) methods.

IPv4 Configuration and Management

Subnet Mask: Identifies network and host portions of an IPv4 address.
SSH vs. Telnet: SSH encrypts and secures remote sessions, while Telnet operates in plaintext and is considered insecure.

Switch Configuration and Security

SVI (Switch Virtual Interface): Allows remote management and requires configuration for switches to have IP addresses.
Basic Security Measures: To secure a small office network, implement a firewall and install antivirus software.
Console Access Security: VTY and console interfaces can have restricted access via passwords.

Various Networking Technologies

Peer-to-Peer: A network model where devices can function interchangeably as clients and servers.
Client/Server Model: Involves server software running on dedicated computers to deliver services to clients.
Powerline Networking: Technology enabling LAN connectivity through electrical outlets.

PDU Encapsulation in OSI Layers

Logical Address Addition: Occurs at the network layer.
Transport Layer Functions: Adds destination port numbers to PDUs.
PDU Data Additions: Data is added at the application layer, source MAC addresses at the data link layer.

General Protocol Functions

Network Protocols: Define rules governing the exchange of messages between source and destination.

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Description

Explore key networking concepts with these flashcards from Module 1-3. Learn about secure remote access methods such as VPNs and scenarios for using WISPs. Perfect for students and professionals looking to solidify their understanding of networking fundamentals.