CompTIA (Networking Practice Test)

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What address should you use as the default gateway address when manually configuring TCP/IP settings on a PC in a SOHO network?

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The default gateway address is the address that a computer sends traffic to if it has no other route in its routing table. That would apply to most Internet addresses, so the default gateway is the device that sends traffic out to the Internet: the Internet router.

192.168.15.211 is what kind of IP address?

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IPv4 addresses follow the format of four decimal octets. IPv6 format is eight hexadecimal quartets. IP addresses that begin with 192.168 are in the RFC1918 set of private addresses.

For twisted pair cabling, which connection sets are used?

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RJ11 and RJ45 are used in twisted pair cabling, commonly for phone lines and ethernet, respectively.

What router setting can you use to restrict access to the router to only the devices you specified in the configuration?

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With MAC filtering enabled, only devices with a MAC address that is listed in the MAC filtering table on the router are allowed access.

This type of wireless encryption is usually seen in larger businesses, and each user must log in with their own credentials. What does this technology's name stand for?

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This is an enterprise grade solution built off of WPA2 encryption. This disables shared wireless access using one password and requires each user to use unique credentials for access.

What must our SOHO router do in order for devices on our local IPv4 network to communicate with other devices on the Internet?

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NAT (Network Address Translation) allows our private local network IPv4 addresses to be translated into a public IP address capable of connecting over the Internet. This can also be used with IPv6, due to security advantages, although it is less likely.

Which Internet connection type is limited to a area near the central office and can rely on existing wiring infrastructure?

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Digital Subscriber Line (DSL) is limited by the distance from the central office for communication and can make use of existing phone lines already in place at your home or business.

Where could you install a Web server that is publically accessible from the Internet but isolated from the rest of your network?

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By creating a DMZ (demilitarized zone), you are setting up a a separate network that is accessible from the Internet. A DMZ makes certain services available to external users while denying access to the rest of your network. Services typically segmented by a DMZ could include: email servers, Web servers, and FTP servers.

Harrold is setting up a new Web server at work, but he doesn't want DHCP to provide it with a new IP address each time he reboots it for maintenance. What kind of Internet address should Harrold assign to the new Web server?

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Static addresses are those that are manually assigned and entered on a device. This will effectively disable DHCP. He should also reserve the IP address in the DHCP pool as good practice to prevent it from being leased to another device.

This protocol is frequently associated with Active Directory in a Windows system for central control of a user database. What is the name of this protocol?

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LDAP (Lightweight Directory Access Protocol) often works in conjunction with Active Directory to provide user authentication and management in a network. It is the successor to the DAP (Directory Access Protocol).

Bong is setting up a new wireless network at his home office and wants some help choosing the right equipment. He requires a device that will not interfere with his 2.4 GHz phones and has a speed of at least 54 Mbps. Which wireless technology would you recommend to Bong?

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802.11n is the only option listed that can operate at either 2.4 or 5 GHz and has a theoretical maximum speed of 600 Mbps; it would also provide the least amount of interference if using the 5 GHz band. 802.11b/g both operate at 2.4 GHz only which could possibly interfere with any other devices in that frequency.

Anthea's new clothing company is rapidly expanding, with plans to add 300 new retail outlets in the next five years. All of these locations will require multiple public IP addresses per store, although they presently have only four. She'd like to implement a new system that would allow her to avoid being restricted by IP addresses in the near future. Which addressing system would you suggest?

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The public IPv4 address space has been exhausted for quite some time now, meaning that all of these addresses have been purchased or allocated, usually by an Internet Service Provider (ISP). Many technical savvy companies have already begun the transition to using IPv6, which contains a possible 340 undecillion addresses, or 2 to the 128th power (yes, a lot of addresses). Many, if not all, ISPs have IPv6 enabled equipment already in operation.

A network of devices utilized in your car, such as connecting your cell phone to the car through Bluetooth, is known as what kind of network?

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PAN (Personal Area Networks ) are networks designed just for you, typically in a very short range. Connecting your cell phone to your car via Bluetooth, or connecting a set of Bluetooth speakers to your cell phone, would both qualify as a PAN.

A network that connects two cities is known as a ____ network?

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Wide Area Networks, also known as WAN, are networks that are connected across long distances, such as city to city or state to state.

In your new home, you've just set up a wifi access point upstairs. When you go down into the basement, though, you lose your signal and are unable to access the Internet. What kind of equipment could you get if you didn't want to buy another access point but still wanted a wireless connection?

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A repeater can re-send the wireless signal into an area that is not covered by the original access point. This would be a good alternative option to buying another access point and can easily repeat the signal onto another floor of a home.

Sally is at her business office in a remote part of town when a thunderstorm causes her laptop to lose Internet service. She uses satellite, so she might have to wait till the storm passes before getting online again. She asks you for a temporary solution because she just has her cell phone with her. What would you recommend?

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Using your cell phone, you have the ability to turn on tethering. This effectively enables you to use your phone as a wireless router that can be connected to network devices, such as a laptop. A similar option is known as a mobile hotspot.

Switches that are designed to participate in routing choices are commonly known as what?

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This is commonly referred to as a Layer 3 switch, as routing decisions work at Layer 3 of the OSI model (network layer) and switches are normally considered Layer 2 devices.

What kind of technology allows signaling and bearer channels to be used?

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ISDN (Integrated Services Digital Network) uses bearer (B) channels to send data and uses D channels for signaling and control.

Andrea is enjoying on her new desktop computer when the computer abruptly shuts down. She double-checks that the power cords are still in place, which they are. Her parents inform her that the power outlet she is using has always created problems, so she feels she should check the power supply in her computer. What device could she use to double-check both voltages?

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A multimeter would be able to check voltage readings from both the power outlet and power supply. This would help narrow down the source of any power issues. A power supply tester’s intended use is strictly to test the power supply unit.

Adrian is a data scientist who spends a lot of time on his desktop computer playing around with large data file. Adrian hears a very loud clicking noise as he tries to pull up one particularly large file. What does this mean?

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Typical hard drives consist of several moving parts required to read and write data. Loud clicking noises usually indicate one of these components inside the drive has failed. Constantly having to read extremely large file sizes could potentially accelerate hard drive failure.

Billy enjoys music and recently borrowed a USB drive from a friend to transfer a new record to his computer. After he's finished, he leaves the USB drive plugged in and turns the computer off for the night. When he tries to start his computer the next day, he gets an error screen that says "OS Not Found." What could the issue be?

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The computer sets up the OS boot sequence in the BIOS. It lists the order in which it should look for an operating system. If the USB drive is listed in a higher priority, it will check here first for the system files. If none are found, or if they are corrupted, it may display this message.

Jack is an avid gamer who spends many hours on his computer playing the latest World of Warcraft installment (WoW). He's been playing for an incredible 36 hours straight during this session! He catches a whiff of a burning smell coming from his computer and turns it down right away. What exactly is the issue?

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Burning smells usually indicate hardware that has burned out or a bad capacitor. To protect other components of your computer from potential damage, it is best to completely power off your machine until you can investigate the cause.

Jay has owned his computer for quite some time and was just telling a friend about how dependable it was. He tries to turn on his computer the next morning, but nothing happens. He double-checks that all cords are plugged in, but it still doesn't work. What could the problem be?

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A computer with no power will not turn on. This could be caused by issues with the power supply inside the computer case, or issues with power coming from the outlet. Even if the cord is plugged in, either of these locations could be lacking in power, thus there would be no transfer of power.

After connecting 100 ethernet cables for your new workplace, you discover that one of the PCs to which you connected them appears to be unconnected. You need to locate the other end of the cable in the data closet, but you forgot to name the cables. What tools could you use to locate the cable's other end?

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By plugging in a tone generator at the jack of one end of the cable, you can find the other end by waving a toner probe around the area you think it could be. A loud tone noise will generate when you have found the end of the cable.

What tool would you use to secure the RJ45 connector to the ethernet connection's wiring?

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A connector is typically crimped as the last step in the process after creating an ethernet cable. This securely tightens down the wiring to the correct spots inside the connector for electrical signals to pass.

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