Questions and Answers (2 / 3)
Operating systems and networks - Set 1
51.
What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?
255.255.255.192
52.
What are two characteristics shared by TCP and UDP? (Choose two.)
port numbering, use of checksum
53.
Why are port numbers included in the TCP header of a segment?
to enable a receiving host to forward the data to the appropriate application
54.
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
55.
Which statement is true about variable-length subnet masking?
The size of each subnet may be different, depending on requirements.
56.
In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)
when a faster delivery mechanism is needed, when applications do not need to guarantee delivery of the data
57.
destination and source port numbers
58.
What is the TCP mechanism used in congestion avoidance?
sliding window
59.
Which scenario describes a function provided by the transport layer?
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
60.
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 destination port number
61.
What are two ways that TCP uses the sequence numbers in a segment? (Choose two.)
to identify missing segments at the destination, to reassemble the segments at the remote location
62.
Which two tasks are functions of the presentation layer? (Choose two.)
compression, encryption
63.
Which three statements characterize UDP? (Choose three.)
UDP provides basic connectionless transport layer functions., UDP relies on application layer protocols for error detection., UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.
64.
What is a key characteristic of the peer-to-peer networking model?
resource sharing without a dedicated server
65.
A technician can ping the IP address of the web server of a remote company but cannot successfully ping the URL address of the same web server. Which software utility can the technician use to diagnose the problem?
nslookup
66.
Which domain name would be an example of a top-level domain?
.com
67.
A PC obtains its IP address from a DHCP server. If the PC is taken off the network for repair, what happens to the IP address configuration?
The address is returned to the pool for reuse when the lease expires.
68.
When planning for network growth, where in the network should packet captures take place to assess network traffic?
on as many different network segments as possible
69.
A wireless host needs to request an IP address. What protocol would be used to process the request?
DHCP
70.
Which example of malicious code would be classified as a Trojan horse?
malware that was written to look like a video game
71.
When applied to a router, which command would help mitigate brute-force password attacks against the router?
login block-for 60 attempts 5 within 60*
72.
A network technician suspects that a particular network connection between two Cisco switches is having a duplex mismatch. Which command would the technician use to see the Layer 1 and Layer 2 details of a switch port?
show interfaces
73.
Where are Cisco IOS debug output messages sent by default?
console line
74.
Match the description with the associated IOS mode. (not all options are used.)
pytanie 74
75.
Refer to the exhibit. Match the packets with their destination IP address to the exiting interfaces on the router. (Not all targets are used.)
pytanie 75
76.
Refer to the exhibit. An administrator is testing connectivity to a remote device with the IP address 10.1.1.1. What does the output of this command indicate?
pytanie 76
77.
A user is unable to reach the web site when typing http://www.cisco.com in a web browser, but can reach the same site by typing http://72.163.4.161. What is the issue?
DNS
78.
A company is expanding its business to other countries. All branch offices must remain connected to corporate headquarters at all times. Which network technology is required to support this requirement?
wan
79.
A home user is looking for an ISP connection that provides high speed digital transmission over regular phone lines. What ISP connection type should be used?
DSL
80.
How does quality of service help a network support a wide range of applications and services?
by providing mechanisms to manage congested network traffic
81.
What source IP address does a router use by default when the traceroute command is issued?
the IP address of the outbound interface
82.
After making configuration changes on a Cisco switch, a network administrator issues a copy running-config startup-config command. What is the result of issuing this command?
The new configuration will be loaded if the switch is restarted.
83.
Refer to the exhibit. A network administrator is configuring access control to switch SW1. If the administrator has already logged into a Telnet session on the switch, which password is needed to access privileged EXEC mode?
83
84.
Match each item to the type of topology diagram on which it is typically identified. (Not all options are used.)
84
85.
Which connection provides a secure CLI session with encryption to a Cisco network device?
a SSH connection
86.
What function does pressing the Tab key have when entering a command in IOS?
It completes the remainder of a partially typed word in a command.
87.
What layer is responsible for routing messages through an internetwork in the TCP/IP model?
transport
88.
Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?
Data is sent from the internet layer to the network access layer.
Packets are sent from the network access layer to the transport layer.
Segments are sent from the transport layer to the internet layer.*
Frames are sent from the network access layer to the internet layer.
Segments are sent from the transport layer to the internet layer.
89.
What unique address is embedded in an Ethernet NIC and used for communication on an Ethernet network?
MAC address
90.
Which procedure is used to reduce the effect of crosstalk in copper cables?
requiring proper grounding connections twisting opposing circuit wire pairs together
91.
During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
The physical address is added.
92.
What are two characteristics of Ethernet MAC addresses? (Choose two.)
They are globally unique., They are expressed as 12 hexadecimal digits.
93.
If a device receives an Ethernet frame of 60 bytes, what will it do?
drop the frame
94.
Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)
The frame has the broadcast address as the destination address., The destination address is unknown to the switch.
95.
Which switching method has the lowest level of latency?
fast-forward
96.
Which two commands can be used on a Windows host to display the routing table? (Choose two.)
route print, netstat -r
97.
Which two functions are primary functions of a router? (Choose two.)
packet forwarding, path selection
98.
What is the binary representation of 0xCA?
pyt 98
99.
At a minimum, which address is required on IPv6-enabled interfaces?
link-local
100.
Which service provides dynamic global IPv6 addressing to end devices without using a server that keeps a record of available IPv6 addresses?
SLAAC