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Questions and Answers
Questions and Answers
What network feature would allow an employee to gain secure remote access to a company network?
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?
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?
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?
Which term refers to a network that provides secure access to the corporate offices by suppliers, customers, and collaborators?
What functionality is provided by DHCP?
What functionality is provided by DHCP?
Which memory location on a Cisco router or switch stores the startup configuration file?
Which memory location on a Cisco router or switch stores the startup configuration file?
What is the function of the shell in an OS?
What is the function of the shell in an OS?
Which type of access is secured on a Cisco router or switch with the enable secret command?
Which type of access is secured on a Cisco router or switch with the enable secret command?
What is the default SVI on a Cisco switch?
What is the default SVI on a Cisco switch?
What is done to an IP packet before it is transmitted over the physical medium?
What is done to an IP packet before it is transmitted over the physical medium?
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?
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?
What are the benefits of using a layered network model?
What are the benefits of using a layered network model?
What is the purpose of protocols in data communications?
What is the purpose of protocols in data communications?
Which logical address is used for delivery of data to a remote network?
Which logical address is used for delivery of data to a remote network?
What is the general term that is used to describe a piece of data at any layer of a networking model?
What is the general term that is used to describe a piece of data at any layer of a networking model?
Match segment, frame, and packet to their corresponding OSI layers.
Match segment, frame, and packet to their corresponding OSI layers.
Which two protocols function at the internet layer? (Choose two.)
Which two protocols function at the internet layer? (Choose two.)
Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?
Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?
Which type of communication will send a message to a group of host destinations simultaneously?
Which type of communication will send a message to a group of host destinations simultaneously?
In computer communication, what is the purpose of message encoding?
In computer communication, what is the purpose of message encoding?
Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?
Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?
What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)
What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)
Which name is assigned to the transport layer PDU?
Which name is assigned to the transport layer PDU?
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?
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?
At which OSI layer is a source IP address added to a PDU during the encapsulation process?
At which OSI layer is a source IP address added to a PDU during the encapsulation process?
At which OSI layer is a destination port number added to a PDU during the encapsulation process?
At which OSI layer is a destination port number added to a PDU during the encapsulation process?
At which OSI layer is data added to a PDU during the encapsulation process?
At which OSI layer is data added to a PDU during the encapsulation process?
At which OSI layer is a source MAC address added to a PDU during the encapsulation process?
At which OSI layer is a source MAC address added to a PDU during the encapsulation process?
Which two statements correctly identify the addressing that ServerB will generate in the process? (Choose two)
Which two statements correctly identify the addressing that ServerB will generate in the process? (Choose two)
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?
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?
What layer of the OSI model deals with how messages are exchanged between the source and the destination?
What layer of the OSI model deals with how messages are exchanged between the source and the destination?
Why would a Layer 2 switch need an IP address?
Why would a Layer 2 switch need an IP address?
What term describes a network where one computer can be both client and server?
What term describes a network where one computer can be both client and server?
What term describes a computing model where server software runs on dedicated computers?
What term describes a computing model where server software runs on dedicated computers?
What term describes a technology that allows devices to connect to the LAN using an electrical outlet?
What term describes a technology that allows devices to connect to the LAN using an electrical outlet?
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Study Notes
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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