ultraedit是什么计算机网络作业

2021年1月27日发(作者：conroe)
Computer Networks. Chapter 1 questions.
1.

What are the two types of services that the Internet provides to its applications?
What are some of characteristics of each of these services?
2.

Briefly
describe
how
the
Internet's
connection-oriented
service
provides
reliable transport.
3.

What advantage does a circuit-switched network have over a packet-switched
network?
4.

What advantages does TDM have over FDM in a circuit-switched network?
5.

Suppose that between a sending host and a receiving host there is exactly one
packet
switch.
The
transmission
rates
between
the
sending
host
and
the
switch
and
between the switch and the receiving host are
R1
and
R2
, respectively. Assuming that the
router uses store-and-forward packet switching, what is the total end-to-end delay to send
a packet of length
L
. (Ignore queuing and propagation delay.)
6.

What are some of the networking technologies that use virtual circuits? Find
good URLs that discuss and explain these technologies.
7.

What is meant by connection state information in a virtual-circuit network?
8.

Suppose you are developing a standard for a new type of network. You need
to decide whether your network will use VCs or datagram routing. What are the pros and
cons for using VCs?
9.

What are the transmission rates of Ethernet LANs? For a given transmission
rate, can each user on the LAN continuously transmit at that rate?
10.

What are some of the physical media that Ethernet can run over?
11.

Dial-up modems, ISDN, HFC and ADSL are all used for residential access.
For each of these access technologies, provide a range of transmission rates and comment
on whether the bandwidth is shared or dedicated.
12.

Consider sending a series of packets from a sending host to a receiving host
over a fixed route. List the delay components in the end-to-end delay for a single packet.
Which of these delays are constant and which do vary?
13.

What are the five layers in the Internet protocol stack? What are the principle
responsibilities for each of these layers?
14.

Which layers in the Internet protocol stack does a router process?
15.

Consider an application which transmits data at a steady rate (e.g., the sender
generates an N-bit unit of data every k time units, where k is small and fixed). Also, when
such an application starts, it will stay on for relatively
long period of time. Answer the
following questions, briefly justifying your answer:
a. Would
a
packet-switched
network
or
a
circuit-switched
network
be
more
appropriate for this application? Why?
b. Suppose
that
a
packet-switching
network
is
used
and
the
only
traffic
in
this
network comes from such applications as described above. Furthermore, assume that the
sum of the application data rates is less that the capacities of each and every link. Is some
form of congestion control needed? Why?
16.

Consider sending a large file of
F
bits from Host A to Host B. There are two
links (and one switch) between A and B, and the links are uncongested (i.e., no
queuing
delays). Host A segments the file into segments of
S
bits each and adds 40 bits of header to
each segment, forming packets of
L = 40 + S
bits. Each link has a transmission rate of
R