Wednesday, August 13, 2008

CCNA 1 Chapter 5

CHAPTER 4

1


Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)
The local host is using well-known port numbers to identify the source ports.
**A termination request has been sent to 192.135.250.10.
Communication with 64.100.173.42 is using HTTP Secure.
**The local computer is accepting HTTP requests.
192.168.1.101:1042 is performing the three-way handshake with 128.107.229.50:80.

2
After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?
13
53
**80
1024
1728

3
Which information is found in both the TCP and UDP header information?
sequencing
flow control
**acknowledgments
source and destination

4
Which is an important characteristic of UDP?
acknowledgement of data delivery
**minimal delays in data delivery
high reliability of data delivery
same order data delivery

5


Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?
create a Layer 1 jam signal
**reach a timeout and resend the data that needs to be acknowledged
send a RESET bit to the host
change the window size in the Layer 4 header

6


Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?
**session establishment
segment retransmit
data transfer
session disconnect

7


Refer to the exhibit. The initial TCP exchange of data between two hosts is shown in the exhibit. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?
2
3
6
**1850
3431
3475

8
Why is flow control used for TCP data transfer?
to synchronize equipment speed for sent data
to synchronize and order sequence numbers so data is sent in complete numerical order
**to prevent the receiver from being overwhelmed by incoming data
to synchronize window size on the server
to simplify data transfer to multiple hosts

9
During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?
The packets will not be delivered.
The packets will be retransmitted from the source.
**The packets will be delivered and reassembled at the destination.
The packets will be delivered and not reassembled at the destination.

10
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
0 to 255
256 to 1022
**0 to 1023
1024 to 2047
49153 to 65535

11
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
TCP
IP
**UDP
HTTP
DNS

12
What are two features of the User Datagram Protocol (UDP)? (Choose two.)
**flow control
**low overhead
connectionless
connection-oriented
sequence and acknowledgements

13
What mechanism is used by TCP to provide flow control as segments travel from source to destination?
sequence numbers
session establishment
**window size
acknowledgments

14
What is dynamically selected by the source host when forwarding data?
destination logical address
source physical address
default gateway address
**source port

15
Why are port numbers included in the TCP header of a segment?
to indicate the correct router interface that should be used to forward a segment
to identify which switch ports should receive or forward the segment
to determine which Layer 3 protocol should be used to encapsulate the data
**to enable a receiving host to forward the data to the appropriate application
to allow the receiving host to assemble the packet in the proper order

16
Which two options represent Layer 4 addressing? (Choose two.)
identifies the destination network
**identifies source and destination hosts
identifies the communicating applications
**identifies multiple conversations between the hosts
identifies the devices communicating over the local media

17
Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?
**encapsulation
flow control
connectionless services
**session establishment
**numbering and sequencing
best effort delivery

18
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
application
presentation
session
**transport
network

19


Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)
This is a UDP header.
**This contains a Telnet request.
This contains a TFTP data transfer.
The return packet from this remote host will have an Acknowledgement Number of 43693.
**This is a TCP header.

20
Which event occurs during the transport layer three-way handshake?
The two applications exchange data.
TCP initializes the sequence numbers for the sessions.
**UDP establishes the maximum number of bytes to be sent.
The server acknowledges the bytes of data received from the client.

CCNA 1 Chapter 4

CHAPTER 4

1


Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)
The local host is using well-known port numbers to identify the source ports.
**A termination request has been sent to 192.135.250.10.
Communication with 64.100.173.42 is using HTTP Secure.
**The local computer is accepting HTTP requests.
192.168.1.101:1042 is performing the three-way handshake with 128.107.229.50:80.

2
After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?
13
53
**80
1024
1728

3
Which information is found in both the TCP and UDP header information?
sequencing
flow control
**acknowledgments
source and destination

4
Which is an important characteristic of UDP?
acknowledgement of data delivery
**minimal delays in data delivery
high reliability of data delivery
same order data delivery

5


Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?
create a Layer 1 jam signal
**reach a timeout and resend the data that needs to be acknowledged
send a RESET bit to the host
change the window size in the Layer 4 header

6


Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?
**session establishment
segment retransmit
data transfer
session disconnect

7


Refer to the exhibit. The initial TCP exchange of data between two hosts is shown in the exhibit. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?
2
3
6
**1850
3431
3475

8
Why is flow control used for TCP data transfer?
to synchronize equipment speed for sent data
to synchronize and order sequence numbers so data is sent in complete numerical order
**to prevent the receiver from being overwhelmed by incoming data
to synchronize window size on the server
to simplify data transfer to multiple hosts

9
During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?
The packets will not be delivered.
The packets will be retransmitted from the source.
**The packets will be delivered and reassembled at the destination.
The packets will be delivered and not reassembled at the destination.

10
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
0 to 255
256 to 1022
**0 to 1023
1024 to 2047
49153 to 65535

11
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
TCP
IP
**UDP
HTTP
DNS

12
What are two features of the User Datagram Protocol (UDP)? (Choose two.)
**flow control
**low overhead
connectionless
connection-oriented
sequence and acknowledgements

13
What mechanism is used by TCP to provide flow control as segments travel from source to destination?
sequence numbers
session establishment
**window size
acknowledgments

14
What is dynamically selected by the source host when forwarding data?
destination logical address
source physical address
default gateway address
**source port

15
Why are port numbers included in the TCP header of a segment?
to indicate the correct router interface that should be used to forward a segment
to identify which switch ports should receive or forward the segment
to determine which Layer 3 protocol should be used to encapsulate the data
**to enable a receiving host to forward the data to the appropriate application
to allow the receiving host to assemble the packet in the proper order

16
Which two options represent Layer 4 addressing? (Choose two.)
identifies the destination network
**identifies source and destination hosts
identifies the communicating applications
**identifies multiple conversations between the hosts
identifies the devices communicating over the local media

17
Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?
**encapsulation
flow control
connectionless services
**session establishment
**numbering and sequencing
best effort delivery

18
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
application
presentation
session
**transport
network

19


Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)
This is a UDP header.
**This contains a Telnet request.
This contains a TFTP data transfer.
The return packet from this remote host will have an Acknowledgement Number of 43693.
**This is a TCP header.

20
Which event occurs during the transport layer three-way handshake?
The two applications exchange data.
TCP initializes the sequence numbers for the sessions.
**UDP establishes the maximum number of bytes to be sent.
The server acknowledges the bytes of data received from the client.

:CCNA 1 Chapter 3

CHAPTER 3

1. What is the purpose of resource records in DNS?
used by the server to resolve names

2. What are two forms of application layer software?
applications
syntax

3. What application layer protocol is commonly used to support for file transfers between a client and a server?
FTP

4. What are two characteristics of peer-to-peer networks?
decentralized resources
resource sharing without a dedicated server

5. Which layer of the OSI model supplies services that allow user to interface with the network?
application

6. What are three properties of peer-to-peer applications?
acts as both a client and server within the same communication
hybrid mode includes a centralized directory of files
does not require specialized software

7. What is the role of the OSI application layer?
provides the interface between the applications on either end of the network

8. What three protocols operate at the Application layer of the OSI model?
DNS, SMTP, POP

9. Which email components are used to forward mail between servers?
MDA, MTA

10. Which two protocols are used to control the transfer of web resources from a web server to a client browser?
HTTPS
HTTP

11. Which statements are correct concerning the role of the MTA in handling email?
receives email from the client's MUA
passes email to the MDA for final delivery
uses SMTP to route email between servers

12. As compared to SSH, what is the primary disadvantage of telnet?
does not support encryption

13. Which application layer protocols correctly match a corresponding function?
DNS dynamically allocates IP addresses to hosts
Telnet provides a virtual connection for remote access

14. What is the automated service that matches resource names with the required IP address?
DNS

15. Refer to the exhibit. What is the destination port for the communication that is represented on line 5?
80

16. What are two characteristics of clients in data networks?
initiate data exchanges
may upload data to servers

17. What application layer protocol describes the services that are used for file sharing in Microsoft networks?
SMB

18. A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model?
centralized administration
security is easier to enforce

19. A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type?
User accounts are centralized.
Security is difficult to enforce.

20. How does the application layer on a server usually process multiple client request for services?
uses support from lower layer functions to distinguish between connections to the service

CCNA EXPLORATION : CCNA 1

CHAPTER 2


1
Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Choose two.)
Network
Transport
Physical**
Data Link**

Session

2
What is a primary function of the trailer information added by the data link layer encapsulation?
supports error detection**
ensures ordered arrival of data
provides delivery to correct destination
identifies the devices on the local network
assists intermediary devices with processing and path selection

3
During the encapsulation process, what occurs at the data link layer?
No address is added.
The logical address is added.
The physical address is added.**
The process port number is added.

4
What device is considered an intermediary device?
file server
IP phone
laptop
printer
switch**

5
Which layer encapsulates the segment into packets?
physical
data link
**network
transport

6
Which statements correctly identify the role of intermediary devices in the network? (Choose three.)
determine pathways for data**
initiate data communications
retime and retransmit data signals**
originate the flow of data
manage data flows**
final termination point for data flow

7
What can be identified by examining the network layer header?
the destination device on the local media
the path to use to reach the destination host**
the bits that will be transferred over the media
the source application or process creating the data

8
What is the proper order of the layers of the OSI model from the highest layer to the lowest layer?
physical, network, application, data link, presentation, session, transport
application, physical, session, transport, network, data link, presentation
application, presentation, physical, session, data link, transport, network
application, presentation, session, transport, network, data link, physical**
presentation, data link, session, transport, network, physical, application

9


Refer to the exhibit. Which three labels correctly identify the network types for the network segments that are shown? (Choose three.)
Network A -- WAN
Network B -- WAN**
Network C -- LAN**
Network B -- MAN
Network C -- WAN
Network A -- LAN**

10
What are the key functions of encapsulation? (Choose three.)
allows modification of the original data before transmission
identifies pieces of data as part of the same communication**
enables consistent network paths for communication
ensures that data pieces can be directed to the correct receiving end device**
enables the reassembly of complete messages**
tracks delay between end devices

11


Refer to the exhibit. Which networking term describes the data interleaving process represented in the graphic?
piping
PDU
streaming
**multiplexing
encapsulation

12
What is a PDU?
corruption of a frame during transmission
data reassembled at the destination
retransmitted packets due to lost communication
**a layer specific encapsulation

13


Refer to the exhibit. "Cell A" at IP address 10.0.0.34 has established an IP session with "IP Phone 1" at IP address 172.16.1.103. Based upon the graphic, which device type best describes the function of wireless device "Cell A?"
the destination device
**an end device
an intermediate device
a media device

14


Refer to the exhibit. Which set of devices contains only end devices?
A, C, D
B, E, G, H
C, D, G, H, I, J
D, E, F, H, I, J
**E, F, H, I, J

15


Refer to the exhibit. Which term correctly identifies the device type that is included in the green area?
source
end
transfer
**intermediary

16
Which three statements best describe a Local Area Network (LAN)? (Choose three.)
**A LAN is usually in a single geographical area.
**The network is administered by a single organization.
The connection between segments in the LAN is usually through a leased connection.
The security and access control of the network are controlled by a service provider.
**A LAN provides network services and access to applications for users within a common organization.
Each end of the network is generally connected to a Telecommunication Service Provider (TSP).

17


Refer to the exhibit. What type of network is shown?
WAN
MAN
**LAN
WLAN

18
What is the purpose of the TCP/IP Network Access layer?
path determination and packet switching
**data representation, encoding, and control
reliability, flow control, and error detection
detailing the components that make up the physical link and how to access it
the division of segments into packets

19
Which characteristic correctly refers to end devices in a network?
manage data flows
**originate data flow
retime and retransmit data signals
determine pathways for data

20
What is the primary purpose of Layer 4 port assignment?
to identify devices on the local media
to identify the hops between source and destination
to identify to the intermediary devices the best path through the network
to identify the source and destination end devices that are communicating
**to identify the processes or services that are communicating within the end devices

21
Select the statements that are correct concerning network protocols. (Choose three.)
**define the structure of layer specific PDU's
dictate how to accomplish layer functions
**outline the functions necessary for communications between layers
limit hardware compatibility
**require layer dependent encapsulations
eliminate standardization among vendors

Saturday, May 17, 2008

About My Hometown- Darjeeling


What do Tenzing Norgay, one of the first two men to set foot on Mount Everest (on May 29, 1953), the World Heritage Himalayan Railway (chosen by UNESCO) with its quaint little toy trains, and some of the finest tea in the world, have in common? Its Darjeeling, the undisputed "Queen of the Hills", situated some 665 km’s. away from Calcutta (now Kolkata) in Eastern India.

Mark Twain once said of Darjeeling that it’s "the one land that all men desire to see, and having seen once - by even a glimpse - would not give that glimpse for the shows of the rest of the world combined."

And nothing could be closer to the truth.

In 1835, Darjeeling was given to the East India Company by the King of Sikkim. It became a popular resort for the British who wanted to escape the sweltering heat of the plains and seek cooler comforts in the north. The town of Darjeeling today occupies an area of 11.44 sq. kms. and has a population of about 100,00. The name Darjeeling itself has two parts to it - ‘dorje’ meaning ‘thunderbolt’ and ‘ling’ meaning ‘place’. So Darjeeling is ‘the Land of Thunderbolts’. However, the serene beauty of the place will have you believe otherwise. The snow-capped peak of the Kanchenjungha in the lap of the lofty Himalayas afar, the sleepy villages shrouded in fog, the lush tea-gardens dotting the landscape, the smiling Sherpa children - Darjeeling, it is said, refuses to age even after a thousand glimpses.

Darjeeling situated some 2134 meters above the sea level, with a splendid range of natural beauty provides a wide variety of activities from leisurely scenic walks and popular sightseeing to more grueling activities such as trekking and river rafting for the adventurous. There’s so much to do while you are in Darjeeling. A visit to the Tiger Hill, standing 2590 meters above the sea level, at daybreak will simply take your breath away as you witness the mesmerizing sunrise over Mt. Kanchenjungha, which is among the tallest peaks in the world.

Then take a walk to the beautifully exotic Japanese Peace Pagoda, the unforgettable Ghoom Monastery (Ghoom also boasts of having the highest railway station in the world), ride the train around the engineering marvel of the Batasia Loop, catch wannabe mountaineers in training at the Tenzing Norgay Himalayan Mountaineering Institute, lose yourself among the orchids at the Lloyd’s Botanical Gardens and pay your homage at the Dhirdam Temple, built in the style of Katmandu’s Pashupatinath Temple.

The Senchal Lake, located some 10 Kms. away from the town and supplying water to the local population, is a place of great beauty in itself. The hub of activity of the city is centered on the Mall, which has a variety of shops, restaurants and hotels. A pony ride along the beautiful walkways around the Mall will remain etched on one’s memory for eternity.

Darjeeling, in the final impression, emerges as a collage of rocks and forests, trickling streams and gushing waterfalls, deep gorges and steep mountains and a most diverse universe of flora and fauna. It takes just one visit to realize the truth of Mark Twain’s words: "…would not give that glimpse for the shows of the rest of the world combined."

Saturday, March 1, 2008

krypton iitd 2008

here are the answers for iitd krypton online treasure hunt

1. tryst (box)
2. click the pencils in the order of VIBGYOR.
3. n.php (change url)
4. cleft (box)
5. centrifugal (box)
6. aztec (box)
7. 8f1cg90p.php (url)
8. gibberish.php (url)
9. radius (box)
10. superman.php (url)
11. android (box)
12. jesus (box)
13. nail (box)
14. experiment (enter in box in the team tab.)
15. rome,1 (box)
16. journalism (box)
17. thirty (box)
18. axle (box)
19. 136 (box)
20. fibonacci (box)
21. ghaziabad (box)
22. cuneiform
23. sunscreen (box)
24. Click the home link.
25. meter (box)
26. sony (box)
27. twentyeight.php (box)
28. kryptonite (box)
29. 262144 (box)
30. 1722
31. calendar
32. reynolds(box)
33. psycho (box)
34. victory
35. congrats



courtsey:sandip gupta APIIT (Asia Pacific Institute of Information Technology, Panipat)

krypton iitd 2008

here are the answers for iitd krypton online treasure hunt

1. tryst (box)
2. click the pencils in the order of VIBGYOR.
3. n.php (change url)
4. cleft (box)
5. centrifugal (box)
6. aztec (box)
7. 8f1cg90p.php (url)
8. gibberish.php (url)
9. radius (box)
10. superman.php (url)
11. android (box)
12. jesus (box)
13. nail (box)
14. experiment (enter in box in the team tab.)
15. rome,1 (box)
16. journalism (box)
17. thirty (box)
18. axle (box)
19. 136 (box)
20. fibonacci (box)
21. ghaziabad (box)
22. cuneiform
23. sunscreen (box)
24. Click the home link.
25. meter (box)
26. sony (box)
27. twentyeight.php (box)
28. kryptonite (box)
29. 262144 (box)
30. 1722
31. calendar
32. reynolds(box)
33. psycho (box)
34. victory
35. congrats

Register for Labyrinth Online Treasure Hunt: http://dextrix.org/labyrinth/register.php

courtsey:sandip gupta APIIT (Asia Pacific Institute of Information Technology, Panipat)