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L E S S O N P L A N #76
Per.
Name:
DATE: Thursday May 5th 2011
CLASS: Networking
TOPIC: How do Cable Modems work?
AIM: How do Cable Modems work?
NOTE:
H.W. # 76:
1) A person is deciding to get broadband Internet service and is
considering DSL and Cable Modem. Which one would you
recommend? Why? In explaining why, state the advantages of
the one you recommend and the disadvantages of the one you
don’t recommend. If you recommend both equally, why?
DO NOW:
I. Go to www.techweb.com/encyclopedia and look up
PPPoE.
II. Answer the sample test questions:
1) Identify the picture at right:
2) ISDN is typically defined as a
A) Packet-switched connection
B) Cell-switched connection
C) Circuit-switched connection
D) Frame-switched connection
3) Modem to modem connections are which of the following?
A) DTE to DTE
B) DTE to DCE
C) DCE to DCE
D) Dependent upon the modulation used
4) Which of the following options represents the connection between the router and a modem?
A) DTE to DTE
B) DTE to DCE
C) DCE to DCE
D) Analog
5) The UART provides which of the following services?
A) Compression
B) Encryption
C) Error Detection D) Buffering
6) Which Cisco IOS command enables CHAP authentication?
A) ppp authentication protocol chap
C) ppp authentication chap
B) authentication chap
D) chap authentication
7) Does CHAP require the use of PPP?
A) Yes, CHAP is a subprotocol of PPP.
C) No, CHAP will work with any IP supported protocol
B) No, only PAP requires PPP
D) No, CHAP only requires PAP
8) Which ISDN device refers to a non-ISDN device such as a POTS phone or fax machine?
A) NT1
B) NT2
C) TA
D) TE2
9) What does the acronym UART stand for?
A) Uniform Analog Response Terminal
C) United Asynchronous Receiver/ Transmitter
PROCEDURE:
Write the AIM and DO NOW.
Get students working!
Take attendance.
Go Over HW
Collect HW
Go over the Do Now
B) Universal Asynchronous Receiver/Transmitter
D) Unimpeded Astronomical Rate of Transfer
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After ISDN came out, cable companies also wanted to deliver broadband service to their customers, just as the phone
companies were doing with ISDN (it was after cable companies rolled out broadband that phone companies rolled out their newer
broadband service, DSL, because they were losing customers to cable companies).
Go to www.howstuffworks.com and look up cable modem.
Answer the following questions:
1) On a cable line, how much bandwidth is given to each channel?
2) What is the name of the device on the Customer end of a cable
modem connection?
3) What is the name of the device on the Provider end of a cable modem
connection?
4) On the provider end what is the name of the location where the CMTS
is located?
5) With respect to being a shared medium (like Ethernet), how does DSL
compare to cable modem?
6) You have just purchased a cable modem and a straight-through category
5e patch cable from a local electronics store. You connect the cable
modem to your computer via a hub which is already connected to your
computer. However, your computer is not able to receive a DHCP
address from the cable modem network DHCP server. What is the
most likely cause of this problem?
A) The cable modem must be directly connected to the computer.
B) The cable modem requires a crossover cable to connect to the hub
C) The cable modem requires RG-6 coaxial cable to connect to the
hub
D) The cable modem must use a category 3 UTP cable to connect to
the hub
7) In the picture at right, which connection connects the cable wire to
the cable modem?
8) In the picture at right, which connector(s) is (are) used to connect the cable modem to the computer?
9) Why is the portion allotted to upstream so small compared to
portion?
the
upstream
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What is the DOCSIS standard? To answer this question, go to www.techweb.com/encyclopedia and look up DOCSIS.
Assignment #1:
Go to http://computer.howstuffworks.com/question606.htm. What is the method is described here for connecting to the
Internet?
What is two-way satellite access?
What is one-way satellite access?
Sample Test Questions:
10) OC-1 has a transmission rate that is close to ___ ?
A) T1
B) T3
C) ISDN
D) Cable Modem
11) Analog transmissions with multiple frequencies such as cable television signals use ___?
A) baseband
B) broadband
C) multiband
D) uniband
12) This has twenty-four 64 Kbps channels for a total of 1.544 Mbps throughput?
A) T1
B) T3
C) ISDN
D) Cable Modem
E) DSL
13) This increases the data rate of modems?
A) Authentication
B) Encryption
C) Synchronization
D) Compression
Assignment #2:
Examine the LZW compression algorithm at this site
http://www.cs.sfu.ca/cs/CC/365/li/squeeze/
Assignment #3:
How could you use Internet Connection Sharing that comes with Windows to share your Internet connection, instead of using a Cable
Modem Router?
Assignment #4:
How do you use Windows XPs Remote Desktop Connection to establish a connection to your computer from another location?
Assignment #5:
Go to http://www.nationwidesatellite.com/hughesnet/?g9100 and examine this advertisement for Satellite Internet Service.
When would this be an appropriate choice?
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Assignment #6:
Check out this company’s advertisement for Satellite Internet Service. How does it compare with the above company?
Sample Test Questions:
14) Of the 4 connection options listed below, which typically offers the slowest connection speed?
A) Cable
B) Dial-up
C) DSL
D) Satelitte
15) What advantage does dial-up have over DSL?
A) Dial-up is faster than DSL
B) You can be farther than 18,000 feet from a main phone service switching center
C) You can get a second phone line to use just for dial-up
D) None. Dial-up has no advantage over DSL
16) Which protocol can you use to send email?
A) IMAP
B) POP3
C) PPP
D) SMTP
17) What advantage does Satellite have over cable for connecting to the Internet?
A) Satellite is faster than cable
B) Cable degrades in stormy weather; satellite does not
C) Satellite requires you to be within 18000 feet of a central switch
D) Cable is limited to areas with cable installed; satellite is not
18) Which Microsoft Technology enables you to share a single Internet connection with multiple computers?
A) Internet Connection Sharing
B) My Network Places
C) Remote Access
D) Remote Desktop
19) Which RG rating of coax is used for cable modems?
A) RG-59
B) RG-58
C) RG-6
D) RG-8
20) Which is not a common term associated with modems?
A) POTS
B) DSL
C) Cable
D) NIC
21) What device includes an adapter that decodes data sent in radio signals?
A) DSL Modem
B) Digital Tanslator
C) Cable Modem
D) Wireless Router