3.1.5 Networks Practice Questions

3.1.5 Practice Questions Score:100% Question1: Which network component connects a device to transmission media and allows the device to send and receive messages? Incorrect Answer: Correct Answer: Client Network interface card Incorrect Answer: Peripheral Incorrect Answer: Protocol Incorrect Answer: Server EXPLANATI ON The network interface card (NIC) allows a device to send and receive messages over the transmission media. Question2:Which of the following statements accurately describes how a modem works? (Select two.) Incorrect Answer: 128 Kbps. Correct Answer: It transmits digital signals over ordinary telephone copper wiring at a rate up to It demodulates analog data from a telephone network into digital PC data. Incorrect Answer: telephone network. It demodulates analog PC data into digital data that can be transmitted through a Incorrect Answer: It communicates over a telephone network using digital signals. Incorrect Answer: can use. It modulates digital data from a telephone network into analog data that a PC Correct Answer: telephone network. It modulates digital data from the PC into analog data and transmits it on a EXPLANATI ON Modem is shorthand for modulator/demodulator. A modem's job is to convert (or modulate) digital data from a PC into analog telephone signals and transmit them through a telephone network. Modems also receive analog data from the telephone network and convert (or demodulate) it into digital PC data. Question3:You have a server that has a 100BaseFX network interface card that you need to connect to a switch. The switch only has 100BaseTX switch ports. Which device should you use? Incorrect Answer: Incorrect Answer: Correct Answer: Repeater Bridge Media converter Incorrect Answer: Gateway Incorrect Answer: Hub EXPLANATI ON Use a media converter to convert from one media type to another media type within the same architecture. Use a bridge to connect two devices that use different network architectures. For example, you can use a bridge to connect a wired network to wireless clients. A hub or a repeater connects devices using the same media type. Question4:Which device sends signals from a computer onto a network? Correct Answer: Transceiver Incorrect Answer: Router Incorrect Answer: Gateway Incorrect Answer: Cable EXPLANATI ON A transceiver (short for transmitter/receiver) sends signals to and receives signals from the network. It translates the parallel data stream of the computer to the serial data stream of the network and vice versa. Most transceivers are now built into network interface cards (NICs). Question5:At which OSI model layer does a media converter operate? Correct Answer: Layer 1 Incorrect Answer: Layer 2 Incorrect Answer: Layer 3 Incorrect Answer: Layer 4 EXPLANATI ON A media converter operates at Layer 1 of the OSI model, the Physical Layer. The media converter translates frames into bits and transmits them on the transmission medium. At Layer 2, the MAC address is added to make the data into a frame. At layer 3, the IP address is added to the packet. A media converter does not alter or use the MAC address or the IP address. Question6:You want a switch to have the ability to modify the media type the switch port supports. Which type of module might you use to make this possible? Correct Answer: SFP Incorrect Answer: OC-x Incorrect Answer: MPLS Correct Answer: GBIC EXPLANATI ON Older network adapters used an external transceiver that matched the media type. While nearly all current network adapters come with a built-in transceiver type, new devices, such as switches and routers, use transceiver modules that allow you to modify the media type of a port by changing the transceiver. There are several types of transceiver modules.  A GBIC (gigabit interface converter) is a large transceiver that fits in a port slot. GBICs are used for Gigabit media, including copper and fiber optic.  An SFP (small form-factor pluggable) is similar to a GBIC but is smaller in size. An SFP is sometimes called a mini-GBIC.  An XFP transceiver is similar in size to an SFP but is used for 10-Gigabit networking. Question7:Which of the following is a valid MAC address? Incorrect Answer: Correct Answer: 83-5A-5B-0B-31-55-F1 C0-34-FF-15-01-8E Incorrect Answer: 34-9A-86-1G-B3-24 Incorrect Answer: 255.255.255.0 Incorrect Answer: 192.168.12.15 Incorrect Answer: 73-99-12-61-15 EXPLANATI ON A MAC or hardware address is a unique identifier hard coded on every network adapter card. A valid MAC address has a total of 12 hexadecimal numbers. Hexadecimal numbers contain the numbers 0 to 9 and the letters A to F. Valid values for each octet in a MAC address range anywhere from 00 to FF. Note that one of the answers would be a valid MAC address except it uses a G value, which is beyond the hexadecimal range. Question8:Which of the following is a valid MAC address? Incorrect Answer: Correct Answer: FABC.875E.9BG6 AB.07.CF.62.16.BD Incorrect Answer: 145.65.254.10 Incorrect Answer: 95ABC2F4.ABC5.569D.43BF EXPLANATI ON MAC addresses are comprised of 12 hexadecimal digits (ranging from 0-9 and A-F). They are typically represented as three sets of four hexadecimal digits or six sets of two hexadecimal digits separated with periods. Regardless of the grouping and separator values, look for 12 hex digits to determine whether a MAC address is valid. Question9:A host wants to send a message to another host that has the IP address 115.99.80.157. IP does not know the hardware address of the destination device. Which protocol can be used to discover the MAC address? Incorrect Answer: ICMP Incorrect Answer: BOOTP Incorrect Answer: IGMP Correct Answer: ARP Incorrect Answer: DNS Incorrect Answer: DHCP EXPLANATI ON Hosts use the address resolution protocol (ARP) to discover the hardware address of a host. Question10:Which of the following is true about the MAC address? (Select two.) Incorrect Answer: It is a 64-bit address. Incorrect Answer: It is typically represented by octets of decimal numbers between 0-255. Correct Answer: It is a 48-bit address. Correct Answer: It is typically represented by hexadecimal numbers. Incorrect Answer: It is a 32-bit address. EXPLANATI ON The MAC address identifies the physical address of the network adapter. The MAC address is a 12-digit (48-bit) hexadecimal number (each number ranges from 0-9 or A-F). The address is often written as 00B0-D0-06-BC-AC or 00B0.D006.BCAC, although dashes, periods, and colons can be used to divide the MAC address parts. An IPv4 address is 32-bits and uses octets of decimal numbers between 0-255. An IPv6 address is a 64-bit address that uses 32 hexadecimal numbers.