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Networking > Module 14 > Flashcards

Module 14 Flashcards

1
Q

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

A
  • transport layer
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2
Q

Which three are transport layer
responsibilities? (Choose three.)
* conversation multiplexing
* identifying frames
* identifying routing information
* segmenting data and reassembling
segments
* tracking individual conversations

A
  • conversation multiplexing
  • segmenting data and reassembling
    segments
  • tracking individual conversations
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3
Q

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.

A
  • UDP is a best-effort delivery
    protocol.
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4
Q

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

A
  • User Datagram Protocol (UDP)
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5
Q

Which transport layer protocol
ensures reliable same-order delivery?
* ICMP
* IP
* TCP
* UDP

A
  • TCP
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6
Q

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.

A
  • It consists of 10 fields in a 20-byte
    header.
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7
Q

Which two applications would use the
TCP transport layer protocol? (Choose
two.)
* FTP
* HTTP
* ICMP
* TFTP
* VoIP

A
  • FTP
  • HTTP
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8
Q

Which of the following is a stateless
best-effort delivery transport layer
protocol?
* ICMP
* IP
* TCP
* UDP

A
  • UDP
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9
Q

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

A
  • It consists of 4 fields in an 8-byte
    header.
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10
Q

Which two applications would use the
UDP transport layer protocol?
(Choose two.)
* FTP
* HTTP
* ICMP
* TFTP
* VoIP

A
  • TFTP
  • VoIP
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11
Q

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

A
  • Destination port number
  • Source port number
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12
Q

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

A
  • 10.1.1.10:1099, 10.1.1.254:80
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13
Q

Which port group includes port
numbers for FTP, HTTP, and TFTP
applications?
* dynamic ports
* private ports
* registered ports
* well-known ports

A
  • well-known ports
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14
Q

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

A
  • netstat
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15
Q

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

A
  • Source: 49152, Destination: 25
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16
Q

.Which control bit flags are used during
the three-way handshake?
* ACK and FIN
* FIN and RESET
* RESET and SYN
* SYN and ACK

A
  • SYN and ACK
17
Q
  1. How many exchanges are needed to
    end both sessions between two
    hosts?
    * one exchange
    * two exchanges
    * three exchanges
    * four exchanges
    * five exchanges
A
  • four exchanges
18
Q

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

A
  • Sequence Number
19
Q

What field is used to provide flow
control?
* Control Bits
* Destination Port
* Sequence Number
* Source Port
* Window Size

A
  • Window Size
20
Q

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.

A
  • The sending host reduces the
    number of bytes it sends before
    receiving an acknowledgment
    from the destination host.
21
Q

Why is UDP desirable for protocols
that make a simple request and reply
transactions?
* Flow Control
* Low overhead
* Reliability
* Same-order delivery

A
  • Low overhead
22
Q

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.

A
  • UDP reassembles the data in the
    order that it was received.
23
Q

.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

A
  • Source: 49152, Destination: 53
24
Q

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.

A
  • The source decreases the amount
    of data that it transmits before it
    receives an acknowledgement
    from the destination.
25
Q

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

A
  • acknowledging received data
  • retransmitting any
    unacknowledged data
26
Q

.What is the TCP mechanism used in
congestion avoidance?
* three-way handshake
* socket pair
* two-way handshake
* sliding window

A
  • sliding window
27
Q

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

A
  • tracking individual conversations
28
Q

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.

A
  • Each request is assigned source
    and destination port numbers.
29
Q

Which two services or protocols use
the preferred UDP protocol for fast
transmission and low overhead?
(Choose two)
* FTP
* DNS
* HTTP
* POP3
* VoIP

A
  • DNS
  • VoIP
30
Q

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

A
  • to keep track of multiple
    conversations between devices
31
Q

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

A
  • 192.168.1.1:80
32
Q

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

A
  • ACK
  • SYN
33
Q

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.

A
  • The part of the FTP message that
    was lost is re-sent.
34
Q

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

A
  • applications that are sensitive to
    delay
35
Q

.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.

A
  • The client randomly selects a
    source port number.
36
Q

Which transport layer feature is used
to guarantee session establishment?
* UDP ACK flag
* TCP 3-way handshake
* UDP sequence number
* TCP port number

A
  • TCP 3-way handshake
37
Q

What is the complete range of TCP
and UDP well-known ports?
* 0 to 255
* 0 to 1023
* 256 – 1023
* 1024 – 49151

A
  • 0 to 1023
38
Q

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

A
  • the combination of a source IP
    address and port number or a
    destination IP address and port
    number

Networking (7 decks)

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