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Reminders
• Course final review with Q&A on Dec 15th
• Final exam on Dec 22th 10:30AM ~ 12:30PM
• Final score available before Dec 29th
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HW1, HW2, HW3, Mid-term: accumulative percentage
20% A, 20% A-, 34% B , 13% C, 10% less than C
Work HarderGoodJob
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More on Final Exam “Comprehensive”, emphasis on
material covered after mid-term Everything in lecture notes Section 1.1 – 1.7 (1.8 excluded) Section 2.1 – 2.8 (2.9 excluded) Section 3.1 – 3.7.1 (3.7.2 excluded) Section 4.1 – 4.8 Section 5.1~5.7 (section 5.8 excluded) Section 6.1 ~ 6.8
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Hints for last-minute preparation
• Jeopardy Game Question (20%)
• Sample Final Exam (20%)
• Lecture notes (20%)
• Homework (20%)
• Textbook (20%)
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CSCI 4211Introduction to Computer Networks
Jeopardy Review
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Rules • Three/Four students form a group.
• After the questions show up, the team raises the # card first to get called on and MUST start to answer the question when TA calls on them with in 10 seconds (otherwise lost points)
• Each team gets one AND ONLY ONE answer per question
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Difference from normal Jeopardy! game• Questions are given, you provide the answer.
(not vise versa)
• The group that answers correctly has the exclusive right to answer the next question.
• At most answer two questions in a row for a group. After that, all groups are allowed to compete for the next question.
• Only The Jeopardy Round and Final Jeopardy round
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Other logistics
• Pengkui is charge of book keeping on white board (one score per group)
• To ensure the smoothness of the game, lecturer makes the FINAL decision whether an answer is correct or not, we can resolve disagreement later.
• Some questions would be related to the final
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Trophies at stake
– The winning team wins 5$ star-buck card per member. You can enjoy together after class.
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Click to begin.
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Click here for Final Jeopardy
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Category AApplication
Category BTransport
Category DNetwork II
Category EDL/Wireless
Level
100 $
200 $
300 $
400 $
500 $
100 $ 100 $ 100 $ 100 $Easy
200 $ 200 $ 200 $ 200 $Medium
300 $
400 $
500 $
300 $ 300 $ 300 $Hard
400 $ 400 $ 400 $Daunting
500 $ 500 $ 500 $ Impossible
Category CNetwork I
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Category AApplication
Category BTransport
Category DReliableProtocols
Category ETCP
CongestionControl
Level
100 $
200 $
300 $
400 $
500 $
100 $ 100 $ 100 $ 100 $Easy
200 $ 200 $ 200 $ 200 $Medium
300 $
400 $
500 $
300 $ 300 $ 300 $Hard
400 $ 400 $ 400 $Daunting
500 $ 500 $ 500 $ Impossible
Category CTCP Connection
Management
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Question 1aThe name of an internet application that listens to the port number 80.
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Answer 1a
HTTP
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Question 2aA special application layer protocol that is essential to the operation of the Internet.
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Answer 2aDNS
Domain Name System
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Question 3a
Name three protocols commonly used for sending and receiving
emails
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Answer 3a
SMTP
IMAP
POP3
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Question 4aSuppose a user at m.a.com types in www.b.com, if no DNS information is cached at any level of DNS hierarchy. How many DNS requests will be issued by m.a.com?
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Answer 4a1
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Question 5aHow many DNS requests are needed to resolve the domain name www.b.com iteratively
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Answer 5a4
m.a.com
www.b.com
root DNS server
local DNS serverDns.a.com
1
23
4
5
6
authoritative DNS serverdns.b.com
78
TLD DNS server.com
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Question 1bHow many sockets are created totally at both client and server sides, when 11 users query a DNS server at the same time?
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Answer 1b1 socket at the server side, 11
sockets at the client side, totally 12.
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Question 2bName at least four key techniques needed for reliable data transfer
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Answer 2bError Detection
ACK/NACK/Retransmission
Sequence Number
Timer
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Question 3bName at least four key functions provided by TCP
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Answer 3bReliable transfer, flow control, congestion control and multiplexing.
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Question 4bWhy the TCP header has a header
length field, while UDP doesn’t
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Answer 4bUDP has a fixed header of 8 bytes
The length of a TCP header is 20 bytes + Options
Length is needed to indicate how long the options are
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Question 5bWhy TCP avoids measuring the Sample-RTT for retransmitted
segments?
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Answer 5bThe source will mistakenly take an old (delayed) acknowledgment as the acknowledgment for retransmitted packet and calculate an incorrect (smaller) value of Sample-RTT.
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Question 1c In a CIDR format 192.168.2.0/12
What is the meaning of 12?
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Answer 1cThe length of network prefix
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Question 2c How many subnets are below?
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Answer 2c8
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Question 3c
A widely used technique for alleviating the IPv4 address shortage
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Answer 3cNAT
Network Address Translation
mapping mulitple intranet IP addresses to a single internet IP address using
different port numbers
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Question 4c How many Class C Internet addresses
would an organization need in order to number 2000 hosts ( classful addressing)?
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Answer 4c2^8-2 = 254 hosts each Class C address.
2000/254 = 7.87 8.
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Question 5c How many packets are needed for RPF
A
B
D
E
c
F
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Answer 5cTotally 11
A
B
D
E
c
F
3
2
2
1
2
1
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Question 1dHow long An IPv6 address is
(in number of bits)
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Answer 1d128 bits
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Question 2dHow many packets is needed for Spanning Tree based Flooding
A
B
D
E
c
F
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Answer 2d5
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Question 3d
Name A Link-State Protocol
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Answer 3d
OSPF
Open Shortest Path First
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Question 4dThe name of the technique that
encapsulates a Multicast IP packet into a Unicast IP packet
(IP-in-IP)
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Answer 4dMulticast Tunneling
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Question 5d
How the BGP Protocol detects routing loops?
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Answer 5dBGP use Path Vector: A sequence of
AS numbers
If the same AS number appears more than once, there is a loop.
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Question 1eWhat is the name of the layer-1 device that repeats the signal
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Answer 1eNetwork Hub/Repeater
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Question 2e
Name the media access control protocol that can guarantee no collision and with
low management overhead
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Answer 2eChannel Partition Protocols
Such as
TDMA, FDMA and CDMA
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Question 3eSuppose switch tables are all empty (assume ARP is up-to-date). If Host A sends a packet to Host B. How many frames are sent in the network?
Host AHost B
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Answer 3e8
Host AHost B
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Question 4eIf Host B replies to Host A right away,
how many frames are sent?
Host AHost B
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Answer 4e3
Self Learning
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Question 5eIn mobile IP indirect routing scenario, who assigns a care-of address (COA)?
(1) Mobile device, (2) Correspondent, (3) Home agent, (4) Foreign agent, or (5) DNS server?
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Answer 5eA care-of-address is the one its gets when it is visiting a foreign network. The COA is assigned by the foreign agent (which can be the edge router in the foreign network or the mobile node itself).
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TCP-Related Questions
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Question 1fWhat is the main problem using the Stop-&-Wait protocol on a 1Gbps link with a propagation delay of 15 ms (and maximum packet size of 1 KB)?
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Answer 1f
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Question 2fIn the Go-Back-N protocol, if 4 bits are used for the sequence numbers, what is the maximum number of packets that can be transmitted in one-round without acknowledgment?
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Answer 2f
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Question 3fIn the Selective Repeat protocol, if 4 bits are used for the sequence numbers, what is the maximum number of packets that can be transmitted in one-round without acknowledgment?
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Question 4fSuppose a TCP sender is currently in the slow-start phase. It transmits 4 segments (each 1500 bytes) in the current round, and the sequence no. carried in the last segment is 6000. When it receives an acknowledgement with ack. no =7501, what value will it set its Congestion Window to?
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Question 5fSuppose a TCP sender is currently in the congestion avoidance phase, and its CongWin is set = 10000 bytes. After it has transmitted 8 segments (each 1500 bytes), a time-out event happens. What will it set its “threshold” variable to?
What value will it set its CongWin to?
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Answer 2f
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Question 3f
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Answer 3f
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Question 4f
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Answer 4f
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Question 5f
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Answer 5f
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Make your wager up to what you have
Write down the wager along with the answer on the back of the index card.
Finish in 3 minutes!!!
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Final Question
Suppose initially all ARP tables and switching tables are empty. Suppose now host A sends an IP data packet to host C. How many Ethernet frames are sent?
A
D
S3
B C
S2 S1
Switch Host
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Formal Class Evaluation Lecturer: Tian HeTA: Pengkui LuoTA: Jaehoon Paul JeongTerm: Fall Current Year: 2009Course ID: 24513 Section: 001
Your positive feedback is very important to me and TAs! Thank you
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Final Answer
14 frames
6 frames for the ARP request4 frames for the ARP reply
4 frames for data