What characteristic describes a DoS attack?

software that is installed on a user device and collects information about the user

What service is provided by SMTP?

Allows clients to send email to a mail server and the servers to send email to other servers.

An application that allows real-time chatting among remote users.

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.

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 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?

loss of signal strength as distance increases

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

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 administrator must first enter privileged EXEC mode before issuing the command.

The entire command, configure terminal, must be used.

The administrator is already in global configuration mode.

The administrator must connect via the console port to access global configuration mode.

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

What are two common causes of signal degradation when using UTP cabling? (Choose two.)

low-quality cable or connectors

loss of light over long distances

Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct?

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.

This host does not have a default gateway configured.

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 during peak utilization times to get a good representation of the different traffic types.

Perform the capture on different networks segments

Capture traffic on the weekends when most employees are off work.

Only capture traffic in the areas of the network that receive most of the traffic.

Refer to the exhibit. On the basis of the output, which two statements about network connectivity are correct? (Choose two.)

There is connectivity between this device and the device at 192.168.100.1.

The average transmission time between the two hosts is 2 milliseconds.

This host does not have a default gateway configured.

There are 4 hops between this device and the device at 192.168.100.1.

The connectivity between these two hosts allows for videoconferencing calls.

Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer? (Choose two.)

Capture traffic during peak utilization times to get a good representation of the different traffic types.

Perform the capture on different network segments.

Capture traffic on the weekends when most employees are off work.

Only capture traffic in the areas of the network that receive most of the traffic such as the data center.

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?

The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.

All router interfaces will be automatically activated.

Each router interface will generate an IPv6 link-local address.

It statically creates a global unicast address on this router.

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?

remove the Ethernet header and configure a new Layer 2 header before sending it out S0/0/0

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

What will happen if the default gateway address is incorrectly configured on a host?

The host cannot communicate with hosts in other networks.

The host cannot communicate with other hosts in the local network.

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.)

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 a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.

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 no device responds to the ARP request, then the originating node will broadcast the data packet to all devices on the network segment.

What is an advantage for small organizations of adopting IMAP instead of POP?

Messages are kept in the mail servers until they are manually deleted from the email client.

POP only allows the client to store messages in a centralized way, while IMAP allows distributed storage.

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.

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

places information in the frame that identifies which network layer protocol is being used for the frame

implements CSMA/CD over legacy shared half-duplex media

integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper

provides the logical addressing required that identifies the device

Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

enables IPv4 and IPv6 to utilize the same physical medium

implements CSMA/CD over legacy shared half-duplex media

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

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 be remotely managed from a host on another network.

The switch can communicate with other hosts on the 172.16.100.0 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?

Communication between the switch and remote users is encrypted.

The SSH client on the switch is enabled.

The switch requires a username/password combination for remote access.

The switch requires remote connections via a proprietary client software.

What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)

The ARP request is sent as a broadcast, and will flood the entire subnet.

All ARP request messages must be processed by all nodes on the local network.

Switches become overloaded because they concentrate all the traffic from the attached subnets.

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.

What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)

The ARP request is sent as a broadcast, and will flood the entire subnet.

All ARP request messages must be processed by all nodes on the local network.

Switches become overloaded because they concentrate all the traffic from the attached subnets.

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.

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.)

netsh interface ipv6 show neighbor

Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication? (Choose two.)

adds Ethernet control information to network protocol data

handles communication between upper layer networking software and Ethernet NIC hardware

responsible for internal structure of Ethernet frame • applies source and destination MAC addresses to Ethernet frame

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.)

places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

adds Ethernet control information to network protocol data

integrates Layer 2 flows between 10 Gigabit Ethernet over fiber and 1 Gigabit Ethernet over copper

• implements CSMA/CD over legacy shared half-duplex media

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

handles communication between upper layer networking software and Ethernet NIC hardware

applies source and destination MAC addresses to Ethernet frame

циско 21-63

Authored by 6frnrdv4vj apple_user

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1st Grade

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53 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

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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?

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?

What characteristic describes a Trojan horse?

What service is provided by HTTPS?

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?

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?

Matching: Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network.

What characteristic describes a DoS attack?

Match the application protocols to the correct transport protocols.

What service is provided by SMTP?

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