Summary

Summary

In this chapter, we examined the basic characteristics of Ethernet, which is the underlying network system used to support most TCP/IP systems. Ethernet is very flexible, supporting multiple speeds, bandwidths, and transmission media, and is mostly reliable. Ethernet can detect and remedy problems occurring because of multiple simultaneous transmissions on the same channel.

Questions

1.	What is the bandwidth for 10Base-2? 2 Mbps 5 Mbps 10 Mbps 100 Mbps
2.	What is the bandwidth for 10Base-5? 2 Mbps 5 Mbps 10 Mbps 100 Mbps
3.	What is the bandwidth for 10Base-T? 2 Mbps 5 Mbps 10 Mbps 100 Mbps
4.	What is the bandwidth for 100Base-T? 2 Mbps 5 Mbps 10 Mbps 100 Mbps
5.	What is the role of physical media segments? To interconnect systems To implement access to Ethernet channels To organize data to be transmitted in a standard way To act as stations
6.	What is the role of Media Access Control (MAC) rules? To interconnect systems To implement access to Ethernet channels To organize data to be transmitted in a standard way To act as a station
7.	What is the role of a frame? To interconnect systems To implement access to Ethernet channels To organize data to be transmitted in a standard way To act as a station
8.	What is the generic title of each host connected to Ethernet? Interconnected system Ethernet channel Data system Station
9.	In what form does transmission across Ethernet occur? Integer Hex Bitwise Char
10.	What is the mechanism for preventing packet collision? Super Collision Detection System (SCDS) Internet Protocol eXtension (IPX) Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Collision Detection Management Access (CDMA)
11.	If a CD event occurs, how can two stations prevent retransmitting at the same time? Randomize delay between retransmission for each network interface. Synchronize all future retransmissions for the next 128 accesses. Initiate a “push me pull me” sequence of asynchronous communication. Activate a “C” class subnet broadcast emergency event.
12.	When more stations are added to a single LAN, what is the likely impact on the number of collisions? The number of collisions occurring will increase. The number of collisions occurring will decrease. The number of collisions occurring will stay the same. The rate of collisions occurring will actually decrease.
13.	How many times will the delivery of a packet be attempted before a transmission failure occurs? 2 4 8 16
14.	What is the range of the data field in an Ethernet frame? 1–1500 bytes 46–1500 bytes 1–1500 bits 46–1500 bits
15.	Which of the following is a valid MAC address? 11:22:33:44:55:AA 22:33:44:55:AA 33:44:55:AA 145.128.43.22

Answers

1.	A. The bandwidth for 10Base-2 is 2 Mbps.
2.	B. The bandwidth for 10Base-5 is 5 Mbps.
3.	C. The bandwidth for 10Base-T is 10 Mbps.
4.	D. The bandwidth for 100Base-T is 100 Mbps.
5.	A. The role of physical media segments is to interconnect systems.
6.	B. The role of Media Access Control (MAC) rules is to implement access to Ethernet channels.
7.	C. The role of a frame is to organize data to be transmitted in a standard way.
8.	D. The generic title of each host connected to Ethernet is station.
9.	C. Transmission across Ethernet occurs in bitwise form.
10.	C. The mechanism for preventing packet collision is Carrier Sense Multiple Access with Collision Detection (CSMA/CD).
11.	A. Two stations can prevent retransmitting at the same time by randomizing the delay between retransmission for each network interface.
12.	A. When more stations are added to a single LAN, the number of collisions occurring will increase.
13.	D. The delivery of a packet will be attempted 16 times before a transmission failure occurs.
14.	B. The range of the data field in an Ethernet frame is 46–1500 bytes.
15.	A. Only 11:22:33:44:55:AA is a valid MAC address.