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WorksheetsCâu hỏi về giao thức mạng
Total questions: 62
Worksheet time: 34mins
What action is performed by a client when establishing communication with a server using UDP at the transport layer?
The client sets the window size for the session.
The client sends an ISN to the server to initiate the three-way handshake process.
The client randomly selects a source port number.
The client sends a synchronization segment to start the session.
Which feature of the transport layer is used to ensure session establishment?
UDP ACK flag
TCP three-way handshake process
UDP sequence number
TCP port number
What is the complete range of TCP and UDP ports?
0 to 255
0 to 1023
256 - 1023
1024 - 49151
What is a socket?
A combination of the source IP address and the destination IP address and the source and destination Ethernet addresses
A combination of the source IP address and port number or the destination IP address and port number
A combination of sequence numbers and source and destination acknowledgment numbers
A combination of sequence numbers and source and destination port numbers
A PC is downloading a large file from a server. The TCP window size is 1000 bytes. The server is sending the file in segments of 100 bytes. How many segments will the server send before requesting an acknowledgment from the PC?
1 segment
10 segments
100 segments
1000 segments
Which factor determines the size of the TCP window?
Amount of data to be transmitted
Number of services included in the TCP segment
Amount of data that the destination can process at one time
Amount of data that the source can send at one time
What does a customer do when they have UDP datagrams to send?
It just sends the datagrams.
It queries the server to see if it is ready to receive data.
It sends a simple three-way handshake process to the server.
It sends a segment to the server with the SYN flag set to synchronize the conversation.
Which fields are used in the UDP header? (Choose three.)
Window size
Checksum
Source port
Length
Acknowledgment number
What is the role of the transport layer in data communication over a network? (Select two.)
Identify the appropriate application for each communication stream
Monitor personal communication between applications on source and destination servers
Provide frame delimitation to identify the bits that make up a frame
Perform frame redundancy checks to detect errors
Provide an interface between applications and the underlying network infrastructure through which messages are transmitted
Which information is used by TCP to reassemble and order the received segments?
Port number
Sequence number
Acknowledgment number
Fragment number
What important information is added to the TCP transport layer header to ensure communication and connection with a remote network device?
Time and synchronization
Destination and source port numbers
Destination and source physical addresses
Destination and source logical network addresses
What characteristics are related to UDP sessions? (Select two.)
Destination devices receive traffic with minimal delay.
Data segments being transmitted are monitored.
Destination devices reassemble messages and forward them to an application.
Received data is not acknowledged.
Unacknowledged data packets will be retransmitted.
A client application needs to terminate a TCP communication session with a server. Arrange the steps in the termination process in the order they will occur.
Which flag in the TCP header is used to acknowledge a received FIN to terminate the connection between two network devices?
FIN
ACK
SYN
RST
Which protocol or service uses UDP for communication from client to server and TCP for communication between servers?
HTTP
FTP
DNS
SMTP
What is a characteristic of UDP?
UDP datagrams follow the same path and arrive in the correct order at the destination.
Applications using UDP are always considered unreliable.
UDP reassembles received datagrams in the order they were received.
UDP only transmits data to the network when the destination is ready to receive data.
What type of port must be requested from IANA to be used with a specific application?
Registered port
Private port
Dynamic port
Source port
Which application protocols use TCP? (Choose three.)
SMTP
FTP
TFTP
HTTP
SNMP
Which statements are characteristic of UDP? (Choose three.)
UDP relies on application layer protocols to detect errors.
UDP provides basic connectionless transport functions.
UDP is a low-cost protocol that does not provide mechanisms for sequencing or flow control.
UDP provides fast data transmission, connected at layer 3.
UDP relies on IP to detect and recover from errors.
Which fields are included in the TCP header but not in the UDP header? (Choose two.)
window
checksum
source port
destination port
sequence number
Which field in the TCP header indicates the state of the three-way handshake process?
window
reserved
checksum
control bits
Why does HTTP use TCP as its transport layer protocol?
To ensure the fastest possible download speed
Because HTTP is the best protocol
Why does HTTP use TCP as its transport layer protocol?
to ensure the fastest possible download speed
because HTTP is the best protocol
because transmission errors can be easily tolerated
because HTTP requires reliable delivery
Which two types of applications are most suitable for UDP? (Select two.)
applications that require flow control
applications that require reliable delivery
applications that handle reliability themselves
applications that need to reorder segments
applications that can tolerate some data loss but require little or no latency
In which two situations will UDP be better than TCP as the preferred transport protocol? (Choose two.)
when applications need to ensure that a packet arrives intact, in order, and without duplication
when a faster delivery mechanism is needed
when delivery costs are not an issue
when applications do not need to ensure data delivery
when destination ports are dynamic
What are the responsibilities of the transport layer? (Select three.)
meet the reliability requirements of applications, if any
aggregate multiple communication streams from multiple users or applications on the same network
determine which applications and services on the client and server should handle the transmitted data
direct packets to the destination network
format data into a compatible form to be received by destination devices
Which three statements describe a DHCP Discover message? (Select three.)
The source MAC address is 48 ones (FF-FF-FF-FF-FF-FF).
The message comes from an IP address allocation server.
All servers receive the message, but only one DHCP server responds.
The message comes from a client seeking an IP address.
The destination IP address is 255.255.255.255.
Which protocols can be used by devices during the email sending process? (Select two.)
DNS
POP
SMTP
IMAP
HTTP
What is true about the Server Message Block protocol?
Different types of SMB messages have different formats.
Clients establish a long-term connection with servers.
SMB messages cannot authenticate a session.
SMB uses the FTP protocol for communication.
What is the function of the HTTP GET message?
to request an HTML page from a web server
to send error information from a web server to a web client
to upload content to a web server from a web client
to retrieve customer emails from an email server using TCP port 110
Which layer in the OSI model provides the interface between applications used for communication and the underlying network infrastructure through which messages are transmitted?
application
presentation
session
transport
Which network model is being used when an author uploads a chapter document to a file server of a book publisher?
peer-to-peer
master-slave
client/server
point-to-point
What do the client/server and peer-to-peer network models have in common?
Both models have dedicated servers.
Both models support devices in the roles of server and client.
Both models require the use of TCP/IP-based protocols.
Both models can only be used in wired network environments.
In which network model are eDonkey, eMule, BitTorrent, Bitcoin, and LionShare used?
peer-to-peer
client-based
master-slave
point-to-point
What popular protocol is used with peer-to-peer applications like WireShare, Bearshare, and Shareaza?
Ethernet
Gnutella
POP
SMTP
What is a main feature of the peer-to-peer network model?
wired network
social network without Internet
network using print server
resource sharing without a dedicated server
Which functions of the three layers of the OSI model are performed by the application layer of the TCP/IP model? (Choose three.)
session
presentation
application
physical
network
An example of network communication using the client-server model is what?
A user uses eMule to download a file shared by a friend after the file's location is determined.
A workstation initiates an ARP to find the MAC address of a receiving server.
A user prints a document using a printer connected to a colleague's workstation.
A workstation initiates a DNS request when the user types www.cisco.com into the browser's address bar.
Which layer in the TCP/IP model is used to format, compress, and encrypt data?
local area network
session
presentation
application
network access
What is an advantage of SMB over FTP?
Only with SMB can data transmission occur in both directions.
Only SMB establishes two simultaneous connections with the client, making data transmission faster.
SMB is more reliable
MB via FTP?
With SMB, data transfer can occur in both directions.
Only SMB establishes two simultaneous connections with the client, making data transfer faster.
SMB is more reliable than FTP because SMB uses TCP and FTP uses UDP.
SMB clients can establish a long-lasting connection with the server.
A manufacturing company registers a number of hosting services from its ISP. The necessary services include global web, file transfer, and email. Which protocols represent these three main applications? (Select three.)
SNMP
DNS
SMTP
HTTP
FTP
Which application protocol uses message types such as GET, PUT, and POST?
DNS
DHCP
SMTP
HTTP
POP3
What information is contained in the DNS MX record?
FQDN of the alias used to identify a service
IP address for an FQDN entry
Domain mapped to mail exchange servers
IP address of an authoritative name server
Which protocols operate at the application layer of the TCP/IP model? (Select three.)
TCP
ARP
DHCP
POP3
FTP
Which protocol is used by a client to communicate securely with a web server?
SMTP
SMB
IMAP
HTTPS
Which applications or services allow servers to act as both clients and servers at the same time?
client/server applications
email applications
P2P applications
authentication services
What are the characteristics of a peer-to-peer network? (Select two.)
scalability
unidirectional data flow
decentralized resources
centralized user accounts
sharing resources without the need for dedicated servers
Which scenario describes a function provided by the transport layer?
A student is using a VoIP phone in class to call home. The unique identifier recorded on the phone is the transport layer address used to communicate with another network device on the same network.
A student is watching a short movie on the web with sound. The movie and sound are encoded in the transport layer header.
A student has two web browser windows open to access two websites. The transport layer ensures that the correct website is sent to the correct browser window.
An employee is accessing a web server located on the company network. The transport layer formats the display so that the website appears correctly regardless of the device used to view the website.
Which layers of the OSI model provide network services similar to those provided by the application layer of the TCP/IP model? (Select three.)
session layer
application layer
presentation layer
physical layer
transport layer
Một PC đang giao tiếp với một máy chủ web có kích thước cửa sổ TCP là 6.000 byte khi gửi dữ liệu và kích thước gói là 1.500 byte. Byte thông tin nào mà máy chủ web sẽ xác nhận sau khi nó đã nhận hai gói dữ liệu từ PC?
3001
6001
4500
6000
Một PC đang giao tiếp với một máy chủ web có kích thước cửa sổ TCP là 6.000 byte khi gửi dữ liệu và kích thước gói là 1.500 byte. Byte thông tin nào mà máy chủ web sẽ xác nhận sau khi nó đã nhận ba gói dữ liệu từ PC?
4501
6001
6000
4500
Một PC đang giao tiếp với một máy chủ web có kích thước cửa sổ TCP là 6.000 byte khi gửi dữ liệu và kích thước gói là 1.500 byte. Byte thông tin nào mà máy chủ web sẽ xác nhận sau khi nó đã nhận bốn gói dữ liệu từ PC?
6001
3001
1501
1500
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ TFTP. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
69
67
53
80
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ FTP. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
21
69
67
80
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ SSH. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
22
69
67
80
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ HTTP. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
80
67
53
69
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ POP3. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
443
69
53
67
110
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ telnet. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
23
443
161
110
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ SNMP. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
161
443
110
80
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ SMTP. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
25
443
161
110
Một máy khách tạo một gói để gửi đến một máy chủ. Máy khách đang yêu cầu dịch vụ HTTPS. Số nào sẽ được sử dụng làm số cổng đích trong gói gửi đi?
443
161
110
80
