1. 100 means 100 Mbps. The Base means baseband, which refers to baseband technology—a signaling method for communication on the network. A. What does the Base mean in 100BaseTX?
2. A MAC, or hardware, address is a 48-bit (6-byte) address written in hexadecimal format. A. How many bits are present in a MAC address?
3. A means by which network devices can auto-detect options such as speed and duplex, just to name two. A LAN switch is a good example of how a port can auto-detect 10Mbps or 100Mbps or full- and half-duplex operation with the network card that is attached to the port via a cable. A. Auto-detect
mechanism
4. A media access method that first senses whether there is a signal on the wire, indicating that someone is transmitting currently. If no one else is transmitting, it attempts a transmission and listens for someone else trying to transmit at the same time. If this happens, both senders back off and don’t transmit again until some specified period of time has passed. A. Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
5. A network in which a cable runs from each network entity to a central device called a hub. The hub allows all devices to communicate as if they were directly connected. A. Physical star topology
6. A transmission technique in which the signal uses the entire bandwidth of a transmission medium. A. Baseband
7. A unit of information storage made up of 4 bits. A. Nibble
8. An implementation of Ethernet that specifies a 10Mbps signaling rate, baseband signaling, and twisted pair cabling. A. 10BaseT
9. Based on the IEEE 802.3u standard, 100BaseTX is the 100Mbps base-band Fast Ethernet specification that uses two pairs of UTP or STP wiring. The first pair of wires receives data; the second pair sends data. To ensure correct signal timing, a 100BaseTX segment cannot be longer than 100 meters. A. 100BaseTX
10. How is the decimal number 10 represented in hexadecimal? A. The first 10 hexadecimal digits (0-9) are the same values as the decimal values. We already know that the binary value for the number 10 is 1010. However, in hex the number 10 needs to be displayed as a single character. To display double-digit numbers as a single character, we substitute letters. In our example, 10 is A.
11. How is the decimal value 10 represented in binary? A. Nibble values are 8 + 4 + 2 + 1, giving us a maximum value of 15. If we have a decimal value of 10, that means the 8 bit and the 2 bit are turned on.
12. How many devices in a collision domain have to listen when a single host talks? A. When one device in a collision domain sends a packet out on a network segment, all other devices on the same physical network segment must wait and let it be transmitted.
13. How many wire pairs are used with 100BaseTX full duplex? A. Full-duplex Ethernet uses two pairs of wires at the same time.
14. How many wire pairs are used with half duplex? A. With half duplex, only one wire pair is used at a time, when a digital signal is either being transmitted or received.
15. If you are using a cable medium called 10Base2, what does this mean? A. You are using the old thinnet coax for your LAN medium; 10Base2 was one of the very first Ethernet network physical mediums and is a thinnet coax.
16. On an Ethernet switched network, what address does one host computer use to communicate with another? A. On an Ethernet network, the MAC address (hardware address) is used by one host to communicate with another.
17. The error condition that occurs when two stations on a CSMA/CD network transmit data (at the Data Link layer) at the same time. A. Collision
18. The general category name was given to 100Mbps Ethernet technologies. A. Fast Ethernet
19. The group of devices whose frames could potentially collide with one another. Each interface on a bridge, switch, or router terminates a collision domain. These devices become responsible for recovering from collisions that occur due to their forwarding of frames out other interfaces. A. Collision domain
20. The port on some NICs that lets you connect the NIC to different media types by using an external transceiver. A. Attachment
Unit Interface (AUI)
port
21. What is the decimal equivalent of the binary number 11000000.10101000.00110000.11110000? A. 11000000 is 192, 10101000 is 168, 00110000 is 48, and 11110000 is 240.
22. What is the decimal value for the binary number 11101000? A. The 128, 64, 32, and 8 bits are on, so on adding the values we get: 128 + 64 + 32 + 8 = 232.
23. What is the effective total throughput increase with a full-duplex connection? A. In full-duplex communication, both devices can send and receive communication at the same time. This means that the effective throughput is doubled and communication is much more efficient.
24. What is the maximum transmission distance of 1000BaseT? A. 100BaseT and 1000BaseT both have a maximum transmission distance of 100 meters, or 328 feet.
25. What is the maximum transmission distance of 10GBaseLR? A. A 10GBaseLR implementation can go a distance of up to 6 miles.
26. What is the maximum transmission distance of 10GBaseSR? A. A 10GBaseSR cable can have a maximum transmission distance of 302 meters (990 feet).
27. What is the purpose of the Frame Check Sequence (FCS) in an Ethernet frame? A. Error detection; the FCS can detect frames in the sequence by calculating the cyclic redundancy check (CRC), which verifies that all the bits in the frame are unchanged.
28. What network access control method helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium? A. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) is a media access control method that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium.
29. Which IEEE standard is used for Ethernet over Power Lines? A. In February 2011, the IEEE finally published a standard for Broadband over Power Line (BPL) called IEEE 1901; this is also referred to as Power Line Communication (PLC) or even Power Line Digital Subscriber Line (PDSL).
30. Which of the following can run full duplex and achieve 200 Mbps with Cat 5e cable? A. 100BaseTX uses CAT 5e and can run 200 Mbps when using full duplex.
31. Which of the following devices (Switch/Router/Host/Hub) does not support full-duplex communication? A. Full-duplex communication cannot be used with a hub because a hub is a half-duplex single communication device. A host, switch, and router have the ability to process traffic (frames), whereas a hub is a multiport repeater.
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