CompTIA A+ Certification Quiz Enhanced 15

What is the primary function of a router in a network as described in the image?

• To provide wireless connectivity only

  Explanation: Incorrect. While some routers provide wireless connectivity, it is not their primary function. Routers primarily manage traffic between networks.

• To forward traffic over the Internet

  Explanation: Correct. Routers primarily function to forward data packets between computer networks, including the Internet, making decisions based on network addresses.

• To connect directly to the Internet without an ISP

  Explanation: Incorrect. Routers cannot connect to the Internet without an Internet Service Provider (ISP); they require an ISP to provide the Internet connection.

• To serve as a firewall only

  Explanation: Incorrect. Although many routers have built-in firewalls for security purposes, their primary function is not to serve as a firewall but to manage and route network traffic.

According to the diagram, what does a SOHO wireless router implement?

• Functions of a digital modem only

  Explanation: Incorrect. A SOHO wireless router does more than just the functions of a digital modem; it also includes features such as routing and wireless access.

• Functions necessary for local network and Internet connectivity

  Explanation: Correct. A SOHO wireless router typically includes functions necessary for both local networking, such as DHCP and NAT, and for connecting to the Internet, which might include a built-in modem.

• Functions of an ISP's point of presence

  Explanation: Incorrect. A SOHO wireless router does not implement the functions of an ISP's point of presence, which involves more complex routing, customer management, and traffic shaping at a larger scale.

• Functions to provide public IP addresses

  Explanation: Incorrect. Typically, the provision of public IP addresses is handled by the ISP, not the SOHO wireless router, which usually assigns private IP addresses within a local network.

What role does the digital modem adapter in the router play according to the image?

• It forwards all network traffic to the Internet

  Explanation: This is incorrect because the digital modem adapter specifically connects to the ISP, not handling all network traffic directly.

• It connects to the external line that connects to the ISP's point of presence

  Explanation: This is correct. The digital modem adapter in a router is responsible for connecting to the external line that links to the ISP, facilitating internet access.

• It provides private IP addresses to the network

  Explanation: Incorrect. Providing private IP addresses is typically the role of a DHCP server within the router, not the modem adapter.

• It acts as the primary router

  Explanation: Incorrect. The digital modem adapter is a component of the router, not the router itself. It does not manage routing functions like directing traffic between devices.

What is the subnet mask for the local private network shown in the diagram?

• 192.168.0.1

  Explanation: This is an IP address, not a subnet mask. Subnet masks are used to specify the network portion of an IP address.

• 203.0.113.1

  Explanation: This is also an IP address and not a subnet mask. It does not define the network boundary.

• 255.255.255.0

  Explanation: This is a correct subnet mask. It is commonly used for small networks and allows for up to 254 hosts on the network.

• 203.0.113.0/29

  Explanation: This represents a CIDR notation which includes both an IP address and a subnet mask. However, the subnet mask part (/29) is not explicitly shown as a traditional subnet mask format.

What does PSTN stand for in the context of telecommunications?

• Public Switched Telephone Network: This is the correct answer. PSTN refers to the worldwide network of voice-oriented public telephone networks that are operated by national, regional, or local telephony operators, providing infrastructure and services for public telecommunication.

• Private System Telephone Network: Incorrect because PSTN is not a private system; it is a public network accessible by the general public and not restricted to a private group or organization.

• Public Sector Telephone Node: Incorrect as PSTN does not stand for 'Telephone Node.' PSTN refers to a network, not a single node, and it encompasses the entire system of telephone lines, fiber optic cables, switching centers, and other infrastructure.

• Personal Standard Telecommunication Network: Incorrect because PSTN is not personalized or standard for an individual's use; it is a standardized network designed for public use across the globe.

Which type of DSL offers high download rates but slower upload rates?

• Symmetric DSL: Offers equal download and upload speeds, hence not the correct answer as it does not provide higher download rates compared to upload rates.

• Asymmetric DSL: Provides higher download rates than upload rates, making it the correct choice for this question.

• Static DSL: This is not a standard term used in DSL technology, thus it is incorrect.

• Dynamic DSL: Also not a recognized term in DSL technology, making it an incorrect choice.

What is the primary function of a splitter in a DSL connection?

• To boost the signal strength: Incorrect. A DSL splitter does not boost signal strength; its main function is to separate signals.

• To connect multiple devices: Incorrect. A DSL splitter is not used for connecting multiple devices directly; it separates voice from data signals.

• To separate voice and data signals: Correct. A DSL splitter separates the analog voice signal from the digital data signal, allowing both to use the same line without interference.

• To encrypt data transmissions: Incorrect. A DSL splitter does not have encryption capabilities; it is purely for signal separation.

What is the maximum download rate typically offered by ADSL2+?

• 1.25 Mbps

  Explanation: This speed is too low for ADSL2+, which typically offers much higher speeds.

• 2.5 Mbps

  Explanation: This is also below the typical speed range for ADSL2+, which can go much higher.

• 24 Mbps

  Explanation: This is correct. ADSL2+ can offer download rates up to 24 Mbps under optimal conditions.

• 12 Mbps

  Explanation: While ADSL2+ can reach this speed, it is not the maximum rate it can achieve.

What type of cable is typically used to connect a DSL modem to the phone point?

• Coaxial cable: Typically used for television signals and internet connections, but not standard for DSL connections to phone points.

• Fiber optic cable: Provides high-speed internet connections and is used in various telecommunications, but not typically for connecting DSL modems to phone points.

• RJ11 cable: Standard cable used to connect DSL modems to phone points, using telephone line infrastructure.

• HDMI cable: Used primarily for audio and video connections between devices like TVs and computers, not suitable for DSL connections.

What does CATV stand for in the context of cable Internet connections?

• Computer Access Television: Incorrect. This is a plausible name but does not represent the standard acronym for cable television services.

• Cable Access TV: Incorrect. While it sounds similar, it is not the commonly accepted abbreviation for cable television services.

• Community Access Television: Incorrect. This term refers to local-access television that allows community members to create content, but it is not related to the standard cable television services.

• Cable Access Television: Correct. CATV stands for Cable Access Television, which is the service provided by cable television companies to deliver television programming through coaxial or fiber-optic cables.