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WorksheetsKiểm tra kiến thức mạng
Total questions: 52
Worksheet time: 31mins
What are the protocols of the transport layer?
Control the transmission of information between two processes on a computer network
Control the content of the message exchanged between two processes and the behavior of each side when receiving the message
Control the transmission of information between two computers on a computer network
Control the transmission of data between two computers on the same transmission medium
What is the correct order from top to bottom in the layered Internet protocol stack?
Application - Transport - Network - Physical - Link
Physical - Link - Network - Transport - Application
Application - Network - Transport - Link - Physical
Application - Transport - Network - Link - Physical
What is the process called when a message is passed through layers and control information is added to the header in the operation of a network device?
Compress
Encapsulation
De-Encapsulation
Header-Adding
Which protocol belongs to the Application layer?
TCP
HTTP
NFS
IP
Which type of delay is the main cause of delay in data transmission?
Processing delay; queuing delay.
Transmission delay; propagation delay.
Processing delay; propagation delay.
Transmission delay; queuing delay.
Look at the image and identify which source is the most common cause of packet delay:
Transmission
Processing at the node
Queuing
Propagation
Among the following models, which model is the most commonly used network model today?
Peer-to-Peer
Remote Access
Ethernet
Client-Server
Which of the following models is the most commonly used network model today?
Peer - to - Peer
Remote Access
Ethernet
Client - Server
In the FTP (File Transfer Protocol), the TCP data connection port on the server is:
20
21
22
23
In the domain name resolution process, the act of delegating the resolution responsibility to the queried domain name server is called:
Recursive query
Sequential query
Interactive query
Continuous query
The default port of the HTTPS service is:
25
53
80
443
In the header formats of a UDP segment, there are 4 fields:
Source port, destination port, length, checksum
Source port, destination port, head length, checksum
Source port, destination port, sequence number, acknowledgement number
Source port, destination port, sequence number, receive window
What is bandwidth?
The speed (in bits/sec) at which bits are transmitted
The time taken to transmit each packet on the network
The waiting time of each packet when transmitted
The maximum amount of data transmitted in a unit of time
The statement 'The speed at which bits are transmitted between sender/receiver' refers to?
Bandwidth
Throughput
Latency
Packet loss
What is network latency?
The time taken to transmit each packet on the network
The speed of each packet transmission slower than normal
The queue being full, causing network latency
Packets lost during data transmission
What happens when the queue is full? One option.
Bandwidth overflow
Latency
Packet loss
Information theft
What does it mean when the packet transmission path is slow? One option.
Bandwidth latency
Bottleneck in the network
What does a slow packet transmission mean?
Bandwidth delay
Bottleneck in data transmission
Both of the above are correct
Both of the above are incorrect
What causes delay and loss of packets?
The speed of packets exceeds the output capacity
Packets must wait in line for their turn
The bandwidth of the transmission is narrowed
All of the above are correct
Fill in the blank: "Packet loss is caused by ... being full".
(a)
Which of the following models is the most commonly used network model today?
Peer-to-Peer
Remote Access
Terminal-Mainframe
Client-Server
Which layer below does not belong to the TCP/IP model?
Application Layer
Session Layer
Link Layer
Network Layer
What is the unit of data according to the layers in the TCP/IP model?
Data, Packet, Segment, Bit, Frame
Data, Packet, Segment, Frame, Bit
Data, Segment, Packet, Frame, Bit
Data, Segment, Packet Bit, Frame
What is the correct order from top to bottom in the OSI model?
Application - Transport - Session - Presentation - Network - Physical - Data Link
Application - Presentation - Session - Transport - Network - Data Link - Physical
Application - Session - Presentation - Transport - Network - Data Link - Physical
Application - Presentation - Session - Transport - Internet - Data Link - Physical
At which layer do TCP and UDP operate in the protocol stack?
Transport Layer
Network Layer
Link Layer
Application Layer
How many layers does the OSI model have?
What layer do TCP and UDP operate at in the protocol stack?
Transport Layer
Network Layer
Link Layer
Application Layer
How many layers does the OSI model have?
5
6
7
8
What is the correct order from top to bottom in the Internet protocol stack?
Application - Transport - Network - Physical - Link
Physical - Link - Network - Transport - Application
Application - Network - Transport - Link - Physical
Application - Transport - Network - Link - Physical
What is the process called when a message is passed through layers and control information is added to the header?
Compress
Encapsulation
De-Encapsulation
Header-Adding
When a data packet moves from a higher layer to a lower layer, what happens to the headers?
Gradually removed
Gradually added
Rearranged
Swapped
When a data packet moves from a lower layer to a higher layer, what happens to the headers?
Gradually removed
Gradually added
Rearranged
Swapped
What are the data units in the OSI model called?
UDP
PDU
OSI
Packet
Which protocol belongs to the Application layer?
TCP
HTTP
NFS
IP
Which OSI layer does not exist?
Internet
Network
Session
Data Link
If a packet of length L=30000 bits is transmitted over a link between 2 routers with a transmission speed of R=10Mbps, a distance of d=300km, and a propagation speed of s=3.10^8 m/s, how should the transmission speed Rnew be adjusted to reduce the end-to-end delay by half (dnew=d/2)?
Rnew=3R
Rnew=2R
Rnew=R
Rnew=R+R/2
How can the end-to-end delay go to half (dnew=d2) adjust the transmission speed Rnew? (Ignore processing delay and queuing delay)
Rnew=3R
Rnew=2R
Rnew=R
Rnew=R+R/2
What is the name of the file being retrieved in this GET message?
quotation3.htm
kurose_ross_sandbox/interactive/quotation3.htm HTTP/1.1
gaia.cs.umass.edu
quotation3.htm HTTP/1.1
In the HTTP protocol, which method is used to request data from the server?
GET
POST
PUT
DELETE
In the DNS protocol, which record is used to map domain names to IP addresses?
A record
CNAME record
MX record
PTR record
In the HTTP protocol, which method is used to create a new resource on the server?
GET
POST
PUT
DELETE
In the HTTP protocol, which method is used to send form data from the client to the server?
GET
POST
PUT
DELETE
What characteristics do applications using the UDP protocol have?
Require a connection.
Do not require high reliability
Require high reliability
Require low latency
In RDT, what mechanism is used to determine the order of packets?
Sequence Number.
Acknowledgment.
Window Size.
Timeout.
In RDT, what mechanism is used to determine that a packet has been lost and needs to be retransmitted?
In which mechanism?
Sequence Number.
Acknowledgment.
Window Size.
Timeout.
In RDT, which mechanism is used to determine that a packet has been lost and needs to be resent?
Go-Back-N.
Selective Repeat.
Stop-and-Wait.
Piggybacking.
Which mechanism does RDT use to synchronize the transmission process between the sender and receiver?
Go-Back-N.
Selective Repeat.
Stop-and-Wait.
Piggybacking.
In the Go-Back-N (Pipelined) operation, the sender transmits simultaneously 3 packets 0, 1, 2. The receiver correctly receives 3 packets and returns 3 ACKs, but the sender only receives ACK(0). Next, the sender will transmit?
Transmit packet 3, 4, 5
Wait until timeout to retransmit packet 1 and packet 2
Transmit packet 2, 3, 4
Transmit packet 1, 2, 3
In the Selective Repeat operation, the sender transmits simultaneously 4 packets 0, 1, 2, 3. The receiver correctly receives 4 packets and returns 4 ACKs. Next, the sender will transmit?
Transmit packet 4, 5, 6
Wait until timeout to retransmit packet 0, packet 1, packet 2, and packet 3
Transmit packet 3, 4, 5
Transmit packet 1, 2, 3, 4
In the Go-Back-N (Pipelined) operation, the sender transmits simultaneously 5 packets 0, 1, 2, 3, 4. The receiver only receives ACK(0) and ACK(1). Next, the sender will transmit?
Transmit packet 2, 3, 4
Wait until timeout to retransmit packet 0 and packet 1
Transmit packet 1, 2, 3, 4, 5
Transmit packet 3, 4, 5
In the Go-Back-N (Pipelined) operation, the sender transmits simultaneously 7 packets 0, 1, 2, 3, 4, 5, 6. The receiver only receives ACK(0), ACK(2), ACK(4), and ACK(5). Next, the sender will transmit?
Transmit packet 3, 4, 5
Wait until timeout to retransmit packet 0 and packet 1
Transmit packet 1, 2, 3, 4, 5, 6, 7
Transmit packet 6, 7, 8
