Worksheetsциско 21-63
Total questions: 53
Worksheet time: 28mins
A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?
DNS
NetBIOS (NetBT)
POP3
IMAP
A network administrator is adding a new LAN to a branch office. The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
What characteristic describes a Trojan horse?
malicious software or code running on an end device
an attack that slows or crashes a device or network service
the use of stolen credentials to access private data
a network device that filters access and traffic coming into a network
What service is provided by HTTPS?
Uses encryption to provide secure remote access to network devices and servers.
Resolves domain names, such as cisco.com, into IP addresses.
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
Allows remote access to network devices and servers.
A technician with a PC is using multiple applications while connected to the Internet. How is the PC able to keep track of the data flow between multiple application sessions and have each application receive the correct packet flows?
The data flow is being tracked based on the destination MAC address of the technician PC.
The data flow is being tracked based on the source port number that is used by each application.
The data flow is being tracked based on the source IP address that is used by the PC of the technician.
The data flow is being tracked based on the destination IP address that is used by the PC of the technician.
A network administrator is adding a new LAN to a branch office. The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.240
255.255.255.224
255.255.255.192
255.255.255.128
Matching: Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network.
192.168.0.0/24
192.168.0.192/27
192.168.0.228/32
192.168.0.0/25
What characteristic describes a DoS attack?
the use of stolen credentials to access private data
a network device that filters access and traffic coming into a network
software that is installed on a user device and collects information about the user
an attack that slows or crashes a device or network service
Match the application protocols to the correct transport protocols.
И
What service is provided by SMTP?
Allows clients to send email to a mail server and the servers to send email to other servers.
Allows remote access to network devices and servers.
Uses encryption to provide secure remote access to network devices and servers.
An application that allows real-time chatting among remote users.
Which scenario describes a function provided by the transport layer?
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 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 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.
Refer to the exhibit. Host B on subnet Teachers transmits a packet to host D on subnet Students. Which Layer 2 and Layer 3 addresses are contained in the PDUs that are transmitted from host B to the router?
Layer 2 destination address = 00-00-0c-94-36-ab Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.200 Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-dd Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.200 Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-cd Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.99 Layer 3 source address = 172.16.10.200
Layer 2 destination address = 00-00-0c-94-36-ab Layer 2 source address = 00-00-0c-94-36-bb Layer 3 destination address = 172.16.20.200 Layer 3 source address = 172.16.100.200
What does the term "attenuation" mean in data communication?
strengthening of a signal by a networking device
leakage of signals from one cable pair to another
time for a signal to reach its destination
loss of signal strength as distance increases
Refer to the exhibit. An administrator is trying to configure the switch but receives the error message that is displayed in the exhibit. What is the problem?
The entire command, configure terminal, must be used.
The administrator is already in global configuration mode.
The administrator must first enter privileged EXEC mode before issuing the command.
The administrator must connect via the console port to access global configuration mode.
Which two protocols operate at the top layer of the TCP/IP protocol suite? (Choose two.)
TCP
IP
UDP
POP
DNS
A company has a file server that shares a folder named Public. The network security policy specifies that the Public folder is assigned Read-Only rights to anyone who can log into the server while the Edit rights are assigned only to the network admin group. Which component is addressed in the AAA network service framework?
automation
accounting
authentication
authorization
What three requirements are defined by the protocols used in network communications to allow message transmission across a network? (Choose three.)
message size
media selection
connector specifications
message encoding
delivery options
What are two characteristics of IP? (Choose two.)
does not require a dedicated end-to-end connection
operates independently of the network media
retransmits packets if errors occur
re-assembles out of order packets into the correct order at the receiver end
guarantees delivery of packets
An employee of a large corporation remotely logs into the company using the appropriate username and password. The employee is attending an important video conference with a customer concerning a large sale. It is important for the video quality to be excellent during the meeting. The employee is unaware that after a successful login, the connection to the company ISP failed. The secondary connection, however, activated within seconds. The disruption was not noticed by the employee or other employees. What three network characteristics are described in this scenario? (Choose three.)
security
quality of service
scalability
powerline networking
fault tolerance
What are two common causes of signal degradation when using UTP cabling? (Choose two.)
improper termination
low-quality shielding in cable
installing cables in conduit
low-quality cable or connectors
loss of light over long distances
Which subnet would include the address 192.168.1.96 as a usable host address?
192.168.1.64/26
192.168.1.32/27
192.168.1.32/28
192.168.1.64/29
Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct?
This host does not have a default gateway configured.
There are 4 hops between this device and the device at 192.168.100.1.
There is connectivity between this device and the device at 192.168.100.1.
The connectivity between these two hosts allows for videoconferencing calls.
The average transmission time between the two hosts is 2 milliseconds.
Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer?
Capture traffic on the weekends when most employees are off work.
Capture traffic during peak utilization times to get a good representation of the different traffic types.
Only capture traffic in the areas of the network that receive most of the traffic.
Perform the capture on different networks segments
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
192.168.1.64/29
Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct? (Choose two.)
This host does not have a default gateway configured.
There are 4 hops between this device and the device at 192.168.100.1.
There is connectivity between this device and the device at 192.168.100.1.
The connectivity between these two hosts allows for videoconferencing calls.
The average transmission time between the two hosts is 2 milliseconds.
Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer? (Choose two.)
Capture traffic on the weekends when most employees are off work.
Capture traffic during peak utilization times to get a good representation of the different traffic types.
Only capture traffic in the areas of the network that receive most of the traffic such as the data center.
Perform the capture on different network segments.
Only capture WAN traffic because traffic to the web is responsible for the largest amount of traffic on a network.
What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?
All router interfaces will be automatically activated.
The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
Each router interface will generate an IPv6 link-local address.
It statically creates a global unicast address on this router.
Which three layers of the OSI model map to the application layer of the TCP/IP model? (Choose three.)
application
network
data link
session
presentation
Refer to the exhibit. If PC1 is sending a packet to PC2 and routing has been configured between the two routers, what will R1 do with the Ethernet frame header attached by PC1?
nothing, because the router has a route to the destination network
open the header and use it to determine whether the data is to be sent out S0/0/0
open the header and replace the destination MAC address with a new one
remove the Ethernet header and configure a new Layer 2 header before sending it out S0/0/0
What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with other hosts in the local network.
The host cannot communicate with hosts in other networks.
A ping from the host to 127.0.0.1 would not be successful.
The host will have to use ARP to determine the correct address of the default gateway.
The switch will not forward packets initiated by the host.
What are two features of ARP? (Choose two.)
When a host is encapsulating a packet into a frame, it refers to the MAC address table to determine the mapping of IP addresses to MAC addresses.
An ARP request is sent to all devices on the Ethernet LAN and contains the IP address of the destination host and its multicast MAC address.
If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
If no device responds to the ARP request, then the originating node will broadcast the data packet to all devices on the network segment.
If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
A network administrator is adding a new LAN to a branch office. The new LAN must support 90 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.128
255.255.255.240
255.255.255.248
255.255.255.224
What are two ICMPv6 messages that are not present in ICMP for IPv4? (Choose two.)
Host Confirmation
Neighbor Solicitation
Router Advertisement
Destination Unreachable
Time Exceeded
A client packet is received by a server. The packet has a destination port number of 80. What service is the client requesting?
DHCP
SMTP
DNS
HTTP
What is an advantage for small organizations of adopting IMAP instead of POP?
POP only allows the client to store messages in a centralized way, while IMAP allows distributed storage.
Messages are kept in the mail servers until they are manually deleted from the email client.
When the user connects to a POP server, copies of the messages are kept in the mail server for a short time, but IMAP keeps them for a long time.
IMAP sends and retrieves email, but POP only retrieves email.
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
ipconfig
netstat
nslookup
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
implements CSMA/CD over legacy shared half-duplex media
enables IPv4 and IPv6 to utilize the same physical medium
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
places information in the frame that identifies which network layer protocol is being used for the frame
provides the logical addressing required that identifies the device
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
ipconfig
netstat
nslookup
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
implements CSMA/CD over legacy shared half-duplex media
enables IPv4 and IPv6 to utilize the same physical medium
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
implements a process to delimit fields within an Ethernet 2 frame
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
The global configuration command `ip default-gateway 172.16.100.1` is applied to a switch. What is the effect of this command?
The switch can communicate with other hosts on the 172.16.100.0 network.
The switch can be remotely managed from a host on another network.
The switch is limited to sending and receiving frames to and from the gateway 172.16.100.1.
The switch will have a management interface with the address 172.16.100.1.
What happens when the `transport input ssh` command is entered on the switch vty lines?
The SSH client on the switch is enabled.
The switch requires a username/password combination for remote access.
Communication between the switch and remote users is encrypted.
The switch requires remote connections via a proprietary client software.
Match the type of threat with the cause. (Not all options are used.)
B
A disgruntled employee is using some free wireless networking tools to determine information about the enterprise wireless networks. This person is planning on using this information to hack the wireless network. What type of attack is this?
DoS
access
reconnaissance
Trojan horse
What service is provided by HTTP?
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
Allows for data transfers between a client and a file server.
An application that allows real-time chatting among remote users.
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?
FTP
DHCP
Telnet
SSH
What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)
Switches become overloaded because they concentrate all the traffic from the attached subnets.
The ARP request is sent as a broadcast, and will flood the entire subnet.
The network may become overloaded because ARP reply messages have a very large payload due to the 48-bit MAC address and 32-bit IP address that they contain.
A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.
All ARP request messages must be processed by all nodes on the local network.
What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)
Switches become overloaded because they concentrate all the traffic from the attached subnets.
The ARP request is sent as a broadcast, and will flood the entire subnet.
The network may become overloaded because ARP reply messages have a very large payload due to the 48-bit MAC address and 32-bit IP address that they contain.
A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.
All ARP request messages must be processed by all nodes on the local network.
A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information? (Choose three.)
ping
netsh interface ipv6 show neighbor
ipconfig
nslookup
arp -a
Refer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. (Not all options are used.)
Лл
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
responsible for internal structure of Ethernet frame
• applies source and destination MAC addresses to Ethernet frame
handles communication between upper layer networking software and Ethernet NIC hardware
adds Ethernet control information to network protocol data
implements trailer with frame check sequence for error detection
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
• implements CSMA/CD over legacy shared half-duplex media
adds Ethernet control information to network protocol data
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.
enables IPv4 and IPv6 to utilize the same physical medium
adds Ethernet control information to network protocol data
applies source and destination MAC addresses to Ethernet frame
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)
enables IPv4 and IPv6 to utilize the same physical medium
applies source and destination MAC addresses to Ethernet frame
handles communication between upper layer networking software and Ethernet NIC hardware
