Chapter 1 Review Questions
1. There is no difference. Throughout this text, the words “host”
and “end system” are used interchangeably. End systems
include PCs, workstations, Web servers, mail servers, PDAs,
Internet-connected game consoles, etc.
2. From Wikipedia: Diplomatic protocol is commonly described as
a set of international courtesy rules. These well-established and
time-honored rules have made it easier for nations and people to
live and work together. Part of protocol has always been the
acknowledgment of the hierarchical standing of all present.
Protocol rules are based on the principles of civility.
3. Standards are important for protocols so that people can create
networking systems and products that interoperate.
4. 1. Dial- up modem over telephone line: home; 2. DSL over
telephone line: home or small office; 3. Cable to HFC: home; 4.
100 Mbps switched Ethernet: enterprise; 5. Wifi (802.11): home
and enterprise: 6. 3G and 4G: wide-area wireless.
5. HFC bandwidth is shared among the users. On the downstream
channel, all packets emanate from a single source, namely, the
head end. Thus, there are no collisions in the downstream
channel.
6. In most American cities, the current possibilities include: dial-
up; DSL; cable modem; fiber-to-the-home.
7. Ethernet LANs have transmission rates of 10 Mbps, 100 Mbps, 1
Gbps and 10 Gbps.
8. Today, Ethernet most commonly runs over twisted-pair copper
wire. It also can run over fibers optic links.
9. Dial up modems: up to 56 Kbps, bandwidth is dedicated; ADSL:
up to 24 Mbps
评论1
最新资源