Final Examination Questions - Computer Networking | ECPE 177 | Exams Computer Systems Networking and Telecommunications

Computer Networking Name ________________________________________

100 points ECPE177, Final Exam

NO CALCULATORS!

c = 3 x 108 m/s = 300 m/usec.

tprop in wire and fiber = 200m/usec = 200 km/msec

PART 1 (8%) – 1 point per question (8 questions): acronyms,

TCP/IP protocol stack, and ISO 7-layer model. (All fill-in)

1. Give the full name of each of the following acronyms.

a. BGP _______________________________________________________________________

b. CIDR ______________________________________________________________________

c. IETF ____________________________________________________________________

d. MIB _____________________________________________________________________

2. Describe the TCP/IP protocol stack, top to bottom, naming each layer and listing the main function.

(5) APPLICATION LAYER – executes network applications

(4) _____________________________________________________________________________________

(3) _____________________________________________________________________________________

(2) _____________________________________________________________________________________

(1) _____________________________________________________________________________________

PART 2 (8%) - 1 point per question (8 questions): Arpanet, Internet, TCP/UDP/

IP. (See last year’s final)(Mostly multiple-choice, some fill-in)

1. ARPANET, from which the Internet evolved, was born in:

a. 1947 b. 1957 c. 1967 d. 1968 e. 1969

2. Instead of circuit switching (like POTS), the ARPANET used _______________________________ switching.

3. Developed by Ray Tomlinson in 1972 at BBN, the Internet's most-used application (the "killer ap" that made

the ARPANET really take off) is:

a. ftp b. smtp c. TCP/IP d. VPNs e. email

4. The one country that is most determined to give the U.S. competition in the dot-com community is:

a. China b. India c. Japan d. Canada e. Great Britain

5. How many Network Access Points (NAPs) were established in 1995?

a. 1 b. 2 c. 3 d. 4 e. 5 f. 6 g. 7 h. 8

6. Which one of the following protocols has the main task of providing reliable, in-order byte-stream data

transfer?

a. IP b. PPP c. FTP d. TCP e. UDP f. HTML

7. Which one of the following protocols is connection-oriented and provides flow control and congestion control?

a. IP b. PPP c. FTP d. TCP e. UDP f. HTML

8. Which one of the following protocols provides unreliable data transfer with its connectionless service?

a. IP b. PPP c. FTP d. TCP e. UDP f. HTML

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Computer Networking Name ________________________________________ 100 points ECPE177, Final Exam NO CALCULATORS! c = 3 x 10^8 m/s = 300 m/usec. tprop in wire and fiber = 200m/usec = 200 km/msec PART 1 (8%) – 1 point per question (8 questions): acronyms, TCP/IP protocol stack, and ISO 7-layer model. (All fill-in)

Give the full name of each of the following acronyms. a. BGP _______________________________________________________________________ b. CIDR ______________________________________________________________________ c. IETF ____________________________________________________________________ d. MIB _____________________________________________________________________
Describe the TCP/IP protocol stack, top to bottom, naming each layer and listing the main function. (5) APPLICATION LAYER – executes network applications (4) _____________________________________________________________________________________ (3) _____________________________________________________________________________________ (2) _____________________________________________________________________________________ (1) _____________________________________________________________________________________ PART 2 (8%) - 1 point per question (8 questions): Arpanet, Internet, TCP/UDP/ IP. (See last year’s final)(Mostly multiple-choice, some fill-in)
ARPANET, from which the Internet evolved, was born in: a. 1947 b. 1957 c. 1967 d. 1968 e. 1969
Instead of circuit switching (like POTS), the ARPANET used _______________________________ switching.
Developed by Ray Tomlinson in 1972 at BBN, the Internet's most-used application (the "killer ap" that made the ARPANET really take off) is: a. ftp b. smtp c. TCP/IP d. VPNs e. email
The one country that is most determined to give the U.S. competition in the dot-com community is: a. China b. India c. Japan d. Canada e. Great Britain
How many Network Access Points (NAPs) were established in 1995? a. 1 b. 2 c. 3 d. 4 e. 5 f. 6 g. 7 h. 8
Which one of the following protocols has the main task of providing reliable, in-order byte-stream data transfer? a. IP b. PPP c. FTP d. TCP e. UDP f. HTML
Which one of the following protocols is connection-oriented and provides flow control and congestion control? a. IP b. PPP c. FTP d. TCP e. UDP f. HTML
Which one of the following protocols provides unreliable data transfer with its connectionless service? a. IP b. PPP c. FTP d. TCP e. UDP f. HTML

PART 3 (30%) - 2 points per question (15 questions): TCP/UDP/IP/Ethernet headers, ATM, MAC protocols, tunneling, Ethernet LAN efficiency. (Mostly multiple-choice, some fill-in)

In the header of an IP packet, the source and destination addresses are: a. IP addresses c. Port numbers b. TCP addresses d. MAC addresses
In the header of a TCP segment, the source and destination addresses are: a. IP addresses c. Port numbers b. TCP addresses d. MAC addresses
In the header of an Ethernet frame, the source and destination addresses are: a. IP addresses c. Port numbers b. TCP addresses d. MAC addresses
Which one of the following has a header with a "RcvWindow" field? a. IP header b. TCP header c. UDP header d. MAC header
Which one of the following has a header that handles fragmentation?
1. IP 2) UDP 3) TCP 4) ATM 5) Ethernet
Which two of the following has a header that indicates the protocol used by the upper layer?
1. IP 2) UDP 3) TCP 4) ATM 5) Ethernet
Which one of the following flags is not in the TCP header?
1. ACK 2) CLR 3) FIN 4) RST 5) SYN 6) URG
How many flags are there in the UDP header? _________________________
How does the TCP protocol know that a segment has an ACK piggybacked onto it?
The 8-byte field (used to synchronize the sender & receiver clocks) that starts Ethernet frames is called the:
1. CRC 2) SYNC 3) prefix 4) suffix 5) preamble
Asynchronous Transfer Mode (ATM) is becoming a major part of the Internet. It differs from TCP/IP in that its "packets" are called "cells." The size of ATM cells is: a. 48 bits b. 53 bits c. 48 bytes d. 53 bytes e. 1K bytes f. variable
Which two of the following are examples of “taking turns” MAC protocols? a. ATM e. TCP b. Polling f. Aloha c. Token passing g. Ethernet
When IPv6 is tunneled inside of IPv4, what is in the data field of the packet sent through the Internet?
Using U = 1/(1+5a) , compute the maximum possible efficiency of a 10 Base-T Ethernet LAN that has a bus 200 meters long and uses packets 10 bits long. ( a = tprop/ttrans ) ____________ SHOW YOUR WORK! 2 pts/question

PART 5 (12%) - 2 points per question (6 questions) on LINK UTILITY. DRAW the timing diagram! DO the easy math! (Tell me where your work is!)

Link utility can be defined as the: a. ratio of bad to good packets b. ratio of data-carrying packets to ACKs c. percentage of time that the transmitter is on d. average number of packets per second that the pipe carries e. the percentage of the pipe that is full while transmitting packets
Satellite links have a ½ second RTT time because geostationary satellites orbit at an altitude of:
1. 360 km 2) 3,600 km 3) 36,000 km 4) 360,000 km
Consider an ABP 4-Mbps satellite channel (pipe length = 250 msec or 1 Mbit) used to send 4-Mbit data frames in one direction, with very short acknowledgements. What is the average throughput? ____________ Mbps
Consider two hosts connected by an ABP 10 Mbps (10 Kbit/msec) channel. The propagation delay, tprop , between the two hosts is 1 msec. What is the maximum average link utility when using a: a. packet size of 10 Kbits? _______ % b. packet size of 20 Kbits? ______ %
Assume a full duplex 1 Gbps TCP channel between two hosts. The propagation delay, tprop , between the two hosts is 10 microseconds. With a packet size of 1.25 Kbytes (10 Kbits), the time needed to transmit one packet into the link is 10 microseconds. What is the link utility when using a window size of 2 packets? __________________ PART 6 (14%) - Lab questions ( 1 point per questions).
The cables used in the Cisco-Compaq Lab are category ____________________
A cross-over cable would be used to connect a router to a ________________________
When you entered “telnet 192.168.0.3 200x” (where x = your station number) at your PC, what piece of equipment were you planning to configure? ___________________________
The command you used to enter the privileged mode was: ____________________________

The command you used to enter the global configuration mode was: ____________________
What do get when you logically AND an IP address with its associated netmask?
What is the long (unabbreviated) version of the IOS command, # sh ip int br?

You just powered up a Cisco 3940 router that has a single 2-port 10 Mbps Ethernet module plugged into slot 2. You are using a PC that is connected to the console (serial) input of the router. List the series of IOS commands you must enter to do the following: Assume the router’s port 2/0 has been configured with IP address 192.169.10.1/20.

Configure the router’s port 1 with IP address 192.169.11.1/20. <== Note: 20! config t <== I get you started

ctrl-z
Continue by configuring the router for RIP and have it route for networks 192.169.10.0 and 192.169.11.0. config t

ctrl-z
Now, configure an extended IP access list to deny inbound telnet traffic on the router’s port 0. Add to the access list an entry that permits all ip traffic on the router’s port 1. config t

ctrl-z
And now apply the access list to the router’s port 1. config t

ctrl-z
Finally, save the running configuration in non-volatile RAM.

Final Examination Questions - Computer Networking | ECPE 177, Exams of Computer Systems Networking and Telecommunications

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