Flashcards
Operating systems and networks - Set 1
Flashcards for quick repetition. Test your networks and operating systems knowledge.
Flashcards: 124
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How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask?
128
62
64
62
A site administrator has been told that a particular network at the site must accommodate 126 hosts. Which subnet mask would be used that contains the required number of host bits?
255.255.255.0
255.255.255.128
255.255.255.128
A network administrator wants to have the same subnet mask for three subnetworks at a small site. The site has the following networks and numbers of devices:
Subnetwork A: IP phones – 10 addresses
Subnetwork B: PCs – 8 addresses
Subnetwork C: Printers – 2 addresses
What single subnet mask would be appropriate to use for the three subnetworks?
255.255.255.248
255.255.255.240
255.255.255.0
255.255.255.240
How many hosts are addressable on a network that has a mask of 255.255.255.248?
6
2
8
14
6
Which subnet would include the address 192.168.1.96 as a usable host address?
192.168.1.32/27
192.168.1.32/28
192.168.1.64/26
192.168.1.64/26
What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?
255.255.255.128
255.255.255.0
255.255.255.192
255.255.255.192
What are two characteristics shared by TCP and UDP? (Choose two.)
default window size
connectionless communication
3-way handshake
ability to to carry digitized voice
port numbering
use of checksum
port numbering
use of checksum
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 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
to enable a receiving host to forward the data to the appropriate application
Refer to the exhibit. Consider the IP address of 192.168.10.0/24 that has been assigned to a high school building. The largest network in this building has 100 devices. If 192.168.10.0 is the network number for the largest network, what would be the network number for the next largest network, which has 40 devices?
pytanie 54
Which statement is true about variable-length subnet masking?
The size of each subnet may be different, depending on requirements.
Each subnet is the same size.
Bits are returned, rather than borrowed, to create additional subnets.
Subnets may only be subnetted one additional time.
The size of each subnet may be different, depending on requirements.
In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)
when a faster delivery mechanism is needed
when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated
when destination port numbers are dynamic
when delivery overhead is not an issue
when applications do not need to guarantee delivery of the data
when a faster delivery mechanism is needed
when applications do not need to guarantee delivery of the data
destination and source logical network addresses
timing and synchronization
destination and source physical addresses
destination and source port numbers
destination and source port numbers
What is the TCP mechanism used in congestion avoidance?
socket pair
sliding window
three-way handshake
sliding window
Which scenario describes a function provided by the transport layer?
A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.
A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.
A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window
A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.
A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window
A user opens three browsers on the same PC to access www.cisco.com to search for certification course information. The Cisco web server sends a datagram as a reply to the request from one of the web browsers. Which information is used by the TCP/IP protocol stack in the PC to identify which of the three web browsers should receive the reply?
the source port numbers
the destination IP address
the source IP address
the destination port number
the destination port number