Module 14 Flashcards
Which layer is responsible for
establishing a temporary
communication session between the
source and destination host
applications?
* application layer
* data link layer
* network layer
* physical layer
* transport layer
- transport layer
Which three are transport layer
responsibilities? (Choose three.)
* conversation multiplexing
* identifying frames
* identifying routing information
* segmenting data and reassembling
segments
* tracking individual conversations
- conversation multiplexing
- segmenting data and reassembling
segments - tracking individual conversations
Which transport layer protocol
statement is true?
* TCP has fewer fields than UDP.
* TCP is faster than UDP.
* UDP is a best-effort delivery
protocol.
* UDP provides reliability.
- UDP is a best-effort delivery
protocol.
Which transport layer protocol would
be used for VoIP applications?
* Session Information Protocol (SIP)
* Transmission Control Protocol
(TCP)
* User Datagram Protocol (UDP)
* VoIP Transfer Protocol
- User Datagram Protocol (UDP)
Which transport layer protocol
ensures reliable same-order delivery?
* ICMP
* IP
* TCP
* UDP
- TCP
Which TCP header statement is true?
* It consists of 4 fields in an 8-byte
header.
* It consists of 8 fields in a 10-byte
header.
* It consists of 10 fields in a 20-byte
header.
* It consists of 20 fields in a 40-byte
header.
- It consists of 10 fields in a 20-byte
header.
Which two applications would use the
TCP transport layer protocol? (Choose
two.)
* FTP
* HTTP
* ICMP
* TFTP
* VoIP
- FTP
- HTTP
Which of the following is a stateless
best-effort delivery transport layer
protocol?
* ICMP
* IP
* TCP
* UDP
- UDP
Which UDP header statement is true?
* It consists of 4 fields in an 8-byte
header.
* It consists of 8 fields in a 10-byte
header.
* It consists of 10 fields in a 20-byte
header.
* It consists of 20 fields in a 40-byte
header
- It consists of 4 fields in an 8-byte
header.
Which two applications would use the
UDP transport layer protocol?
(Choose two.)
* FTP
* HTTP
* ICMP
* TFTP
* VoIP
- TFTP
- VoIP
Which two fields are the same in a
TCP and UDP header? (Choose two.)
* Control bits
* Destination port number
* Sequence number
* Source port number
* Well-known port number
- Destination port number
- Source port number
Assume a host with IP address
10.1.1.10 wants to request web
services from a server at 10.1.1.254.
Which of the following would display
the correct socket pair?
* 1099:10.1.1.10, 80:10.1.1.254
* 10.1.1.10:80, 10.1.1.254:1099
* 10.1.1.10:1099, 10.1.1.254:80
* 80:10.1.1.10, 1099:10.1.1.254
- 10.1.1.10:1099, 10.1.1.254:80
Which port group includes port
numbers for FTP, HTTP, and TFTP
applications?
* dynamic ports
* private ports
* registered ports
* well-known ports
- well-known ports
Which Windows command would
display the protocols in use, the local
address and port numbers, the foreign
address and port numbers, and the
connection state?
* ipconfig /all
* ping
* netstat
* traceroute
- netstat
Which of the following would be valid
source and destination ports for a
host connecting to an email server?
* Source: 25, Destination: 49152
* Source: 80, Destination: 49152
* Source: 49152, Destination: 25
* Source: 49152, Destination: 80
- Source: 49152, Destination: 25
.Which control bit flags are used during
the three-way handshake?
* ACK and FIN
* FIN and RESET
* RESET and SYN
* SYN and ACK
- SYN and ACK
- How many exchanges are needed to
end both sessions between two
hosts?
* one exchange
* two exchanges
* three exchanges
* four exchanges
* five exchanges
- four exchanges
What field is used by the destination
host to reassemble segments into the
original order?
* Control Bits
* Destination Port
* Sequence Number
* Source Port
* Window Size
- Sequence Number
What field is used to provide flow
control?
* Control Bits
* Destination Port
* Sequence Number
* Source Port
* Window Size
- Window Size
What happens when a sending host
senses there is congestion?
* The receiving host increases the
number of bytes it sends before
receiving an acknowledgment
from the sending host.
* The receiving host reduces the
number of bytes it sends before
receiving an acknowledgment
from the sending host.
* The sending host increases the
number of bytes it sends before
receiving an acknowledgment
from the destination host.
* The sending host reduces the
number of bytes it sends before
receiving an acknowledgment
from the destination host.
- The sending host reduces the
number of bytes it sends before
receiving an acknowledgment
from the destination host.
Why is UDP desirable for protocols
that make a simple request and reply
transactions?
* Flow Control
* Low overhead
* Reliability
* Same-order delivery
- Low overhead
Which UDP datagram reassembly
statement is true?
* UDP does not reassemble the
data.
* UDP reassembles the data in the
order that it was received.
* UDP reassembles the data using
control bits.
* UDP reassembles the data using
sequence numbers.
- UDP reassembles the data in the
order that it was received.
.Which of the following would be valid
source and destination ports for a
host connecting to a DNS server?
* Source: 53, Destination: 49152
* Source: 1812, Destination: 49152
* Source: 49152, Destination: 53
* Source: 49152, Destination: 1812
- Source: 49152, Destination: 53
Network congestion has resulted in
the source learning of the loss of TCP
segments that were sent to the
destination. What is one way that the
TCP protocol addresses this?
* The source decreases the amount
of data that it transmits before it
receives an acknowledgement
from the destination.
* The source decreases the window
size to decrease the rate of
transmission from the destination.
* The destination decreases the
window size.
* The destination sends fewer
acknowledgement messages in
order to conserve bandwidth.
- The source decreases the amount
of data that it transmits before it
receives an acknowledgement
from the destination.
Which two operations are provided by
TCP but not by UDP? (Choose two.)
* identifying the applications
* acknowledging received data
* tracking individual conversations
* retransmitting any
unacknowledged data
* reconstructing data in the order
received
- acknowledging received data
- retransmitting any
unacknowledged data
.What is the TCP mechanism used in
congestion avoidance?
* three-way handshake
* socket pair
* two-way handshake
* sliding window
- sliding window
What is a responsibility of transport
layer protocols?
* providing network access
* tracking individual conversations
* determining the best path to
forward a packet
* translating private IP addresses to
public IP addresses
- tracking individual conversations
How does a networked server manage
requests from multiple clients for
different services?
* The server sends all requests
through a default gateway.
* Each request is assigned source
and destination port numbers.
* The server uses IP addresses to
identify different services.
* Each request is tracked through
the physical address of the client.
- Each request is assigned source
and destination port numbers.
Which two services or protocols use
the preferred UDP protocol for fast
transmission and low overhead?
(Choose two)
* FTP
* DNS
* HTTP
* POP3
* VoIP
- DNS
- VoIP
What is the purpose of using a source
port number in a TCP
communication?
* to notify the remote device that the
conversation is over
* to assemble the segments that
arrived out of order
* to keep track of multiple
conversations between devices
* to inquire for a nonreceived
segment
- to keep track of multiple
conversations between devices
Which number or set of numbers
represents a socket?
* 01-23-45-67-89-AB
* 21
* 192.168.1.1:80
* 10.1.1.15
- 192.168.1.1:80
Which two flags in the TCP header are
used in a TCP three-way handshake to
establish connectivity between two
network devices? (Choose two.)
* ACK
* FIN
* PSH
* RST
* SYN
* URG
- ACK
- SYN
What happens if part of an FTP
message is not delivered to the
destination?
* The message is lost because FTP
does not use a reliable delivery
method.
* The FTP source host sends a query
to the destination host.
* The part of the FTP message that
was lost is re-sent.
* The entire FTP message is re-sent.
- The part of the FTP message that
was lost is re-sent.
What type of applications are best
suited for using UDP?
* applications that are sensitive to
delay
* applications that need reliable
delivery
* applications that require
retransmission of lost segments
* applications that are sensitive to
packet loss
- applications that are sensitive to
delay
.Which action is performed by a client
when establishing communication
with a server via the use of UDP at the
transport layer?
* The client sets the window size for
the session.
* The client sends an ISN to the
server to start the 3-way
handshake.
* The client randomly selects a
source port number.
* The client sends a synchronization
segment to begin the session.
- The client randomly selects a
source port number.
Which transport layer feature is used
to guarantee session establishment?
* UDP ACK flag
* TCP 3-way handshake
* UDP sequence number
* TCP port number
- TCP 3-way handshake
What is the complete range of TCP
and UDP well-known ports?
* 0 to 255
* 0 to 1023
* 256 – 1023
* 1024 – 49151
- 0 to 1023
What is a socket?
* the combination of the source and
destination IP address and source
and destination Ethernet address
* the combination of a source IP
address and port number or a
destination IP address and port
number
* the combination of the source and
destination sequence and
acknowledgment numbers
* the combination of the source and
destination sequence numbers
and port numbers
- the combination of a source IP
address and port number or a
destination IP address and port
number
