Net 125 Final Exam
Which three statements characterize UDP? (Choose three.)
UDP relies on application layer protocols for error detection.
On which switch interface would an administrator configure an IP address so that the switch can be managed remotely?
VLAN1
What is a key characteristic of the peer-to-peer networking model?
resource sharing without a dedicated server
What are two services provided by the OSI network layer? (Choose two.)
routing packets toward the destination
Which name is assigned to the transport layer PDU?
segment
What are two examples of the cut-through switching method? (Choose two.)
fragment-free switching
What type of IPv6 address is FE80::1?
link-local
Which example of malicious code would be classified as a Trojan horse?
malware that was written to look like a video game
Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)
network
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
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
A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?
partial mesh
A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?
physical layer
What are two characteristics shared by TCP and UDP? (Choose two.)
port numbering
Which domain name would be an example of a top-level domain?
.com
What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.)
10.0.0.0/8
Which three addresses are valid public addresses? (Choose three.)
128.107.12.117
What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.)
172.16.0.0/12
What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.)
192.168.0.0/16
Which subnet would include the address 192.168.1.96 as a usable host address?
192.168.1.64/26
Which three addresses are valid public addresses? (Choose three.)
198.133.219.17
What is the most compressed representation of the IPv6 address 2001:0000:0000:abcd:0000:0000:0000:0001?
2001:0:0:abcd::1
What is the dotted decimal representation of the IPv4 address 11001011.00000000.01110001.11010011?
203.0.113.211
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
255.255.255.128
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
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?
255.255.255.240
How many hosts are addressable on a network that has a mask of 255.255.255.248?
6
How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask?
62
Which three addresses are valid public addresses? (Choose three.)
64.104.78.227
What are three characteristics of multicast transmission? (Choose three.)
A single packet can be sent to a group of hosts.
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.
What method is used to manage contention-based access on a wireless network?
CSMA/CA
A wireless host needs to request an IP address. What protocol would be used to process the request?
DHCP
Which range of link-local addresses can be assigned to an IPv6-enabled interface?
FE80::/10
Which two tasks are functions of the presentation layer? (Choose two.)
encryption
What are two benefits of using a layered network model? (Choose two.)
It assists in protocol design.
What purpose does NAT64 serve in IPv6?
It converts IPv6 packets into IPv4 packets.
What is an advantage to using a protocol that is defined by an open standard?
It encourages competition and promotes choices.
What is the function of the shell in an OS?
It interfaces between the users and the kernel.
What are two characteristics of fiber-optic cable? (Choose two.)
It is more expensive than UTP cabling is.
What are two characteristics of fiber-optic cable? (Choose two.)
It is not affected by EMI or RFI.*
What is a characteristic of the LLC sublayer?
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
What are two benefits of using a layered network model? (Choose two.)
It prevents technology in one layer from affecting other layers.
What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not match its own MAC address?
It will discard the frame.
What are three characteristics of multicast transmission? (Choose three.)
Multicast transmission can be used by routers to exchange routing information.
What is a benefit of using cloud computing in networking?
Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.
What are three characteristics of multicast transmission? (Choose three.)
Routers will not forward multicast addresses in the range of 224.0.0.0 to 224.0.0.255.
What protocol is responsible for controlling the size of segments and the rate at which segments are exchanged between a web client and a web server?
TCP
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.
A network technician is attempting to configure an interface by entering the following command: SanJose(config)# ip address 192.168.2.1 255.255.255.0. The command is rejected by the device. What is the reason for this?
The command is being entered from the wrong mode of operation.
Which statement is true about variable-length subnet masking?
The size of each subnet may be different, depending on requirements.
Which three statements characterize UDP? (Choose three.)
UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.
Which three statements characterize UDP? (Choose three.)
UDP provides basic connectionless transport layer functions.
What is a characteristic of a fault tolerant network?
a network that recovers quickly when a failure occurs and depends on redundancy to limit the impact of a failure
Which connection provides a secure CLI session with encryption to a Cisco switch?
an SSH connection
Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?
audio conference, financial transactions, web page
What is a characteristic of UTP cabling
cancellation
Which two tasks are functions of the presentation layer? (Choose two.)
compression
What are two examples of the cut-through switching method? (Choose two.)
fast-forward switching
What are two examples of the cut-through switching method? (choose two)
fast-forward switching
What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.)
data link layer addressing
What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.)
delimiting groups of bits into frames
What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.) data link layer addressing
delimiting groups of bits into frames
What addresses are mapped by ARP?
destination MAC address to a destination IPv4 address
What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?
destination and source port numbers
What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.)
detection of errors through CRC calculations
What are two services provided by the OSI network layer? (Choose two.)
encapsulating PDUs from the transport layer
What is the TCP mechanism used in congestion avoidance?
sliding window
What information is added during encapsulation at OSI Layer 3?
source and destination IP address
Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?
store-and-forward switching
Which type of UTP cable is used to connect a PC to a switch port?
straight-through
A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the amount of traffic that is currently crossing the network
A network engineer is measuring the transfer of bits across the company backbone for a mission critical database application. The engineer notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the amount of traffic that is currently crossing the network
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
A network engineer is measuring the transfer of bits across the company backbone for a mission critical database application. The engineer notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the latency that is created by the number of network devices that the data is crossing
A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the latency that is created by the number of network devices that the data is crossingthe latency that is created by the number of network devices that the data is crossing
A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the type of traffic that is crossing the network
A network engineer is measuring the transfer of bits across the company backbone for a mission critical database application. The engineer notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)
the type of traffic that is crossing the network
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
What are two ways that TCP uses the sequence numbers in a segment? (Choose two.)
to identify missing segments at the destination
Why does a Layer 3 device perform the ANDing process on a destination IP address and subnet mask?
to identify the network address of the destination network
An administrator uses the Ctrl-Shift-6 key combination on a switch after issuing the ping command. What is the purpose of using these keystrokes?
to interrupt the ping process
What are two ways that TCP uses the sequence numbers in a segment? (Choose two.)
to reassemble the segments at the remote location
What are two functions of NVRAM? (Choose two.)
to retain contents when power is removed
What are two functions of NVRAM? (Choose two.)
to store the startup configuration file
Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)
transport
What are two characteristics shared by TCP and UDP? (Choose two.)
use of checksum
What are two actions performed by a Cisco switch? (Choose two.)
using the source MAC addresses of frames to build and maintain a MAC address table
What are two actions performed by a Cisco switch? (Choose two.)
utilizing the MAC address table to forward frames via the destination MAC address
In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)
when a faster delivery mechanism is needed
In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)
when applications do not need to guarantee delivery of the data