A卷—正確率98.2
1．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
192.168.1.64/29
192.168.1.64/26
2.What is a characteristic of the LLC sublayer?
It provides the logical addressing required that identifies the device.
It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.
It provides delimitation of data according to the physical signaling requirements of the medium.
It defines software processes that provide services to the physical layer.
3.What are the three primary functions provided by Layer 2 data encapsulation? (Choose three.)
data link layer addressing
error correction through a collision detection method
placement and removal of frames from the media
detection of errors through CRC calculations
delimiting groups of bits into frames
conversion of bits into data signals
session control using port numbers
4.Which name is assigned to the transport layer PDU?
packet
data
frame
bits
segment
5.How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask?
64
62
254
192
190
6.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
exec-timeout 30
banner motd
service password-encryption
7 . Which range of link-local addresses can be assigned to an IPv6-enabled interface?
FE80::/10
FDEE::/7
FF00::/8
FEC0::/10
8.What are two ways that TCP uses the sequence numbers in a segment? (Choose two.)
to determine if the packet changed during transit
to identify missing segments at the destination
to specify the order in which the segments travel from source to destination
to limit the number of segments that can be sent out of an interface at one time
to reassemble the segments at the remote location
9 . 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
point-to-point
hub and spoke
mesh
10 . What are two services provided by the OSI network layer? (Choose two.)
placement of frames on the media
routing packets toward the destination
encapsulating PDUs from the transport layer
performing error detection
collision detection
11 . Match the description with the associated IOS mode. (Not all options are used.)
user EXEC mode
limited number of basic monitoring commands
the first entrance into the CLI of an IOS device
privileged EXEC mode
accessed by entering the enable command
identified by a prompt ending with the # character
global configuration mode
changes made affect the operation of the device as a whole
accessed by entering the configure terminal command
12 . What is a benefit of using cloud computing in networking?
Home networking uses existing electrical wiring to connect devices to the network wherever there is an electrical outlet, saving the cost of installing data cables.
Technology is integrated into every-day appliances allowing them to interconnect with other devices, making them more ‘smart’ or automated.
End users have the freedom to use personal tools to access information and communicate across a business network.
Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.
13 . Refer to the exhibit. A network administrator is configuring access control to switch SW1. If the administrator uses a console connection to connect to the switch, which password is needed to access user EXEC mode?
letmein
secretin
lineconin
linevtyin
14 . Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?
fragment-free switching
fast-forward switching
store-and-forward switching
cut-through switching
15 . A wireless host needs to request an IP address. What protocol would be used to process the request?
SNMP
HTTP
ICMP
FTP
DHCP
16 . What is an advantage to using a protocol that is defined by an open standard?
It encourages competition and promotes choices.
An open standard protocol is not controlled or regulated by standards organizations.
The protocol can only be run on equipment from a specific vendor.
A company can monopolize the market.
17 . 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?
network layer
data link layer
presentation layer
physical layer
18 . 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?
HTTP
Ethernet
IP
TCP
19 . Which statement is true about variable-length subnet masking?
Subnets may only be subnetted one additional time.
Each subnet is the same size.
The size of each subnet may be different, depending on requirements.
Bits are returned, rather than borrowed, to create additional subnets.
20 . What is a characteristic of UTP cabling?
immunity to electrical hazards
woven copper braid or metallic foil
cancellation
cladding
21．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?
255.255.255.240
255.255.255.224
255.255.255.0
255.255.255.128
22 . On which switch interface would an administrator configure an IP address so that the switch can be managed remotely?
FastEthernet0/1
VLAN 1
vty 0
console 0
23．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
a network that can expand quickly to support new users and applications without impacting the performance of the service delivered to existing users
a network that protects confidential information from unauthorized access
a network that supports a mechanism for managing congestion and ensuring reliable delivery of content to all users
24．What method is used to manage contention-based access on a wireless network?
CSMA/CD
CSMA/CA
token passing
priority ordering
25．What are two benefits of using a layered network model? (Choose two.)
It speeds up packet delivery.
It prevents designers from creating their own model.
It assists in protocol design.
It prevents technology in one layer from affecting other layers.
It ensures a device at one layer can function at the next higher layer.
26．What is an example of a top-level domain?
cisco.com
.com
www.cisco.com
root.cisco.com
27 . Which connection provides a secure CLI session with encryption to a Cisco switch?
an SSH connection
an AUX connection
a Telnet connection
a console connection
28．What is the dotted decimal representation of the IPv4 address 11001011.00000000.01110001.11010011?
209.165.201.223
203.0.113.211
198.51.100.201
192.0.2.199
29 . Refer to the exhibit. What will be the result of entering this configuration the next time a network administrator connects a console cable to the router and no additional commands have been entered?
The administrator will be required to enter Cisco123 .
The administrator will be required to enter Cisco234 .
The administrator will be presented with the R1> prompt.
The administrator will be required to enter Cisco789.
30．What addresses are mapped by ARP?
destination IPv4 address to the source MAC address
destination MAC address to the source IPv4 address
destination MAC address to a destination IPv4 address
destination IPv4 address to the destination host name
31 . 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 syntax is wrong.
The command is being entered from the wrong mode of operation.
The interface is shutdown and must be enabled before the switch will accept the IP address.
The subnet mask information is incorrect.
32．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 allow the user to complete the command
to restart the ping process
to interrupt the ping process
to exit to a different configuration mode
33 . 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
show ip interface brief
show mac-address-table
show running-config
34 . 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 remove the frame from the media.
It will discard the frame.
It will forward the frame to the next host.
It will strip off the data-link frame to check the destination IP address.
35．What is the function of the shell in an OS?
It interacts with the device hardware.
It interfaces between the users and the kernel.
It provides the intrusion protection services for the device.
It provides dedicated firewall services.
36．What purpose does NAT64 serve in IPv6?
It converts IPv6 packets into IPv4 packets.
It converts the 48-bit MAC address into a 64-bit host address that can be used for automatic host addressing.
It converts regular IPv6 addresses into 64-bit addresses that can be used on the Internet.
It translates private IPv6 addresses into public IPv6 addresses.
It enables companies to use IPv6 unique local addresses in the network.
37 Refer to the exhibit. If host A sends an IP packet to host B, what will the destination address be in the frame when it leaves host A?
CC:CC:CC:CC:CC:CC
172.168.10.65
DD:DD:DD:DD:DD:DD
BB:BB:BB:BB:BB:BB
AA:AA:AA:AA:AA:AA
172.168.10.99
38．What is a key characteristic of the peer-to-peer networking model?
network printing using a print server
resource sharing without a dedicated server
wireless networking
social networking without the Internet
39 . 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?
financial transactions, web page, audio conference
audio conference, web page, financial transactions
audio conference, financial transactions, web page
financial transactions, audio conference, web page
40．Where are Cisco IOS debug output messages sent by default?
console line
vty lines
Syslog server
memory buffers
41 . What are two characteristics of fiber-optic cable? (Choose two.)
It is not affected by EMI or RFI.
It is more expensive than UTP cabling is.
It combines the technique of cancellation, shielding, and twisting to protect data.
Each pair of cables is wrapped in metallic foil.
It typically contains 4 pairs of fiber-optic wires.
42 . 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?
The address is permanent and nothing changes.
The address is held by the server to be reissued when the PC is returned.
The address is returned to the pool for reuse when the lease expires.
The address lease is automatically renewed until the PC is returned.
43．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.
44 . 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
the sophistication of the encapsulation method applied to the data
the type of traffic that is crossing the network
the latency that is created by the number of network devices that the data is crossing
the bandwidth of the WAN connection to the Internet
the reliability of the gigabit Ethernet infrastructure of the backbone
45 . What are two functions of NVRAM? (Choose two.)
to contain the running configuration file
to store the routing table
to store the ARP table
to retain contents when power is removed
to store the startup configuration file
46．What are the three ranges of IP addresses that are reserved for internal private use? (Choose three.)
127.16.0.0/12
172.16.0.0/12
10.0.0.0/8
192.31.7.0/24
192.168.0.0/16
64.100.0.0/14
47 . Which two OSI model layers have the same functionality as two layers of the TCP/IP model? (Choose two.)
physical
transport
session
network
data link
48 Refer to the exhibit. Match the packets with their destination IP address to the exiting interfaces on the router. (Not all targets are used.)
FastEthernet0/0
• packets with destination of 172.17.6.15
FastEthernet0/1
• packets with destination of 172.17.14.8
FastEthernet1/0
• packets with destination of 172.17.12.10
FastEthernet1/1
• packets with destination of 172.17.10.5
Serial0/0/0
• packets with destination of 172.17.8.20
The packet is dropped.
49 . What is the most compressed representation of the IPv6 address 2001:0000:0000🔡0000:0000:0000:0001?
2001:🔡:1
2001:0000🔡:1
2001:0🔡:1
2001:🔡0:1
2001:0:0🔡:1
50 . What are three characteristics of multicast transmission? (Choose three.)
Computers use multicast transmission to request IPv4 addresses.
The source address of a multicast transmission is in the range of 224.0.0.0 to 224.0.0.255.
Routers will not forward multicast addresses in the range of 224.0.0.0 to 224.0.0.255.
Multicast messages map lower layer addresses to upper layer addresses.
A single packet can be sent to a group of hosts.
Multicast transmission can be used by routers to exchange routing information.
51 . Which example of malicious code would be classified as a Trojan horse?
malware that was written to look like a video game
malware that can automatically spread from one system to another by exploiting a vulnerability in the target
malware that attaches itself to a legitimate program and spreads to other programs when launched
malware that requires manual user intervention to spread between systems
52．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?
tracert
netstat
ipconfig
nslookup
53．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 IP address
the source port number
the destination IP address
the destination port number
54．Which two tasks are functions of the presentation layer? (Choose two.)
compression
session control
encryption
addressing
authentication