CompTIA Practice Test #3

The two host-to-host protocols are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgments, and UDP does not. Because of this, TCP is often referred to as connection oriented, whereas UDP is connectionless.

When installing dual-channel RAM, be sure that the RAM modules both have the same parameters. In some cases, you might even need to make sure they come from the same manufacturer.

The BNC connector locks by twisting one-quarter turn. F-connectors are threaded and screw into place. SC and ST connectors are for fiber-optic cable.

Device Manager has been present in every version of Windows since Windows 95. It allows you to manage all of your hardware devices, including updating drivers and disabling the device. It is found within the Computer Management console.

For network-enabled laser printers, no connectivity can be a sign of improperly configured IP settings such as the IP address. While each printer is somewhat different, you can manually configure most laser printers’ IP settings through the LCD control panel.

Internet Message Access Protocol (IMAP) is a secure protocol designed to download email. It has several advantages over the older Post Office Protocol 3 (POP3). First, IMAP4 works in connected and disconnected modes. Second, it lets you store the email on the server, as opposed to POP3, which requires you to download it. Third, IMAP4 allows multiple clients to be simultaneously connected to the same inbox.

Infrared (IR) is a short-distance, line-of-sight, point-to-point communication method. It's usually used to transfer small amounts of data from one device to another. The maximum functional distance of IR in mobile devices is about 1 meter, with a viewing angle of about 30 degrees.

The Remote Desktop Protocol (RDP) allows users to connect to remote computers and run programs on them. It uses port 3389.

Infrared is a short-distance, line-of-sight wireless communication method. If line of sight is broken, the communication will end.

Plasma displays place electrodes in front of and behind sealed chambers full of inert gas (such as neon) and vaporized mercury. Current is run through the gas to ionize it and cause it to light up.

Dynamic Host Configuration Protocol (DHCP) dynamically assigns IP addresses and other IP configuration information to network clients.

Rule #1 of troubleshooting is to always check your connections first. The most common issue that prevents network connectivity on a wired network is a bad or unplugged patch cable.

The most likely explanation is that the wireless router is overheating. If it randomly shuts down in the afternoon, being in the sun may contribute to overheating.

The authentication server facilitates the challenge/response service for validating someone's credentials.

A personal area network (PAN) is a small-scale network designed around one person within a limited boundary area. The term generally refers to networks that use Bluetooth technology.

A home server PC should be able to handle media streaming as well as file and printer sharing. A dedicated print server is not likely needed, though, as the operating system can function as a print server. A gigabit NIC will be helpful to manage the network traffic, and a RAID array can help protect against hard drive failure.

A personal area network (PAN) is a small-scale network designed around one person within a limited boundary area. The term generally refers to networks that use Bluetooth technology.

USB 1.0 supports 12 Mbps. In following standards, USB 2.0 supports 480 Mbps, USB 3.0 supports 5 Gbps and USB 3.1 Gen 2 supports 10 Gbps.

Embedded MultiMediaCard (eMMC) can be permanently embedded on the circuit board of a cheaper or smaller mobile device. All of the other flash memory standards, such as CompactFlash, xD, miniMMC, and microMMC, are designed to be removable.

A modem allows computers to connect to a remote network (such as an ISP) via telephone lines. Modems were the most common Internet connection method in the 1990s but are uncommon today. NICs are expansion cards for network connections. USB and cellular are not expansion cards. Other types of expansion cards include video cards, sound cards, storage cards, TV tuner cards, and riser cards.

Of the wireless communication methods, infrared (IR) and near-field communication (NFC) are the hardest to hack. IR communication is limited to about 1 meter, with a viewing angle of about 30 degrees. You would know if someone was trying to intercept the signal. NFC is limited to about 4" (10 cm). It would be pretty obvious if someone were trying to intercept that signal.

PCI is a shared-bus topology, so mixing 33 MHz and 66 MHz adapters in a 66 MHz system will slow all adapters to 33 MHz.

To combine both hard drives into one volume, you need to create a spanned, striped, or mirrored volume. A mirrored volume, like a RAID-1 array, will make one of the disks redundant, so in this case it would not give the user 1 TB of storage. A striped volume is like RAID-0 and will give you a slight performance boost.

RS-232 was introduced in 1960 and was very common in 25-pin format for connecting printers and other peripherals as well as the 9-pin for connecting to network devices.

If the network card doesn't have any lights, it doesn't have a connection. It could be that the cable is bad or that it's not plugged in on the other side, or it could also be a problem with the NIC or the connectivity device on the other side. If nobody else in the same area is having the same problem, that points to an issue with this computer or cable.

Failure to open files means that the computer can't properly read those files. In most cases, this indicates an issue with the hard drive.

The end-point management server can be a policy-based or directory-based technique toward controlling access to network resources.

If the system had been operating normally but now tells you RAID not found, it's likely something is wrong with the RAID controller. Double-check to ensure that the RAID controller BIOS is configured properly and everything is connected as it should be.

There are three types of addresses in IPv6: unicast, anycast, and multicast. A unicast address identifies a single node on the network. An anycast address refers to one that has been assigned to multiple nodes. A multicast address is one used by multiple hosts. IPv6 does not use broadcasts.

Normal (unsecured) websites are accessed on port 80, which is the port that Hypertext Transfer Protocol (HTTP) uses. Shut it down, and no one will be able to access websites, except secure sites that use HTTPS, which is on port 443.

Multimode fiber (MMF) and UTP CAT6 and newer support 10 Gbps transmission speeds.

DB9 was the “D” format, 9-pin connector type that was the standard format for keyboards, mice, and other small peripherals.

The Near-field communication (NFC) is a wireless technology that uses radio frequency (RF) signals with limited range, about 4" (10 cm).

Some wireless cards will have their connection and activity lights alternatively blink if there is no network connection. If the card had failed, there likely would be no lights on it at all.

RAID-5 arrays require a minimum of three hard drives. Since the computer already has one, he therefore needs two more.

Certain unacceptable video-quality issues (such as jerky refresh speeds or lags) can be remedied by adding memory to a video card. Doing so generally results in an increase in both quality and performance. If you can't add memory to the video card, you can upgrade to a new one.

RAID-10 is a mirrored striped set. As long as one drive in each mirrored pair is functional (just as in RAID-1), you shouldn't lose any data. Simply replace the failed disk and rebuild the array.

DDR3 SODIMMs have 204 pins. DDR and DDR2 SODIMMS have 200 pins each, and older SDDRAM has 144 pins.

Server Message Block (SMB) is a protocol used to provide shared access to files, printers, and other network resources. In a way, it functions a bit like FTP, only with a few more options, such as the ability to connect to printers and more management commands.

Wi-Fi Protected Access 2 (WPA2) is a huge improvement over WEP and WPA. It uses Counter Mode CBC-MAC Protocol (CCMP), which is a protocol based on the Advanced Encryption Standard (AES) security algorithm. CCMP-AES was created to address the shortcomings of TKIP, so consequently it's much stronger than TKIP.

Each IPv6 interface can and often does have multiple addresses assigned to it. IPv6 is backward compatible with IPv4.

MiniSD and microSD cards are smaller than standard SD memory cards. Adapters are available to allow them to work in standard SD slots.

DDR has 184 pins, DDR2 and DDR3 have 240 pins, and SODIMMs can have 72, 100, 144, 200, or 204 pins. DDR4 has 288 pins while DDR4 SODIMMs have 260 pins. Last, MicroDIMMs and MiniDIMMs at 240 pins.

At the Internet layer of TCP/IP, Address Resolution Protocol (ARP) resolves logical IP addresses to physical MAC addresses built into network cards. Reverse ARP (RARP) resolves MAC addresses to IP addresses.

Wi-Fi (802.11a, b, g, n, or ac) and Bluetooth can be used to connect a printer temporarily to a single computer (or mobile device), and the connection does not have permanent status. This type of configuration is known as an ad hoc network connection. When Wi-Fi is used to connect printers to a network on a more permanent basis, it is known as infrastructure mode.

The port and SSL settings are used to first configure email on a device. The correct port will depend largely on whether you are using the IMAP or POP3 protocol. The SSL settings are not required but should be filled in to permit encrypted email.

The IEEE standard 802.15.1 is commonly known as Bluetooth. The first step in using Bluetooth after enabling the protocol is finding a device with which to pair.

Hubs can be either active or passive. Passive hubs connect all ports electrically but do not have their own power source. Active hubs use electronics to amplify and clean up the signal before it is broadcast to the other ports.