циско 21-63

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.