ITN 120-159

Multiple Choice

Users report that the network access is slow. After questioning the employees, the network administrator learned that one employee downloaded a third-party scanning program for the printer. What type of malware might be introduced that causes slow performance of the network?

• virus

• worm

• phishing

• spam

Multiple Choice

A user is executing a tracert to a remote device. At what point would a router, which is in the path to the destination device, stop forwarding the packet?

• when the router receives an ICMP Time Exceeded message

• when the RTT value reaches zero

• when the host responds with an ICMP Echo Reply message

• when the value in the TTL field reaches zero

• when the values of both the Echo Request and Echo Reply messages reach zero

Multiple Select

A network technician is researching the use of fiber optic cabling in a new technology center. Which two issues should be considered before implementing fiber optic media? (Choose two.)

• Fiber optic cabling requires different termination and splicing expertise from what copper cabling requires.

• Fiber optic cabling requires specific grounding to be immune to EMI.

• Fiber optic cabling is susceptible to loss of signal due to RFI.

• Fiber optic cable is able to withstand rough handling.

• Fiber optic provides higher data capacity but is more expensive than copper cabling.

Multiple Choice

Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?

• Header Length

• Differentiated Services

• Time-to-Live

• Fragment Offset

Multiple Choice

A user is complaining that an external web page is taking longer than normal to load.The web page does eventually load on the user machine. Which tool should the technician use with administrator privileges in order to locate where the issue is in the network?

• ping

• nslookup

• tracert

• ipconfig /displaydns

Multiple Select

What two pieces of information are displayed in the output of the show ip interface brief command? (Choose two.)

• IP addresses

• interface descriptions

• MAC addresses

• next-hop addresses

• Layer 1 statuses

Multiple Choice

What single subnet mask would be appropriate to use for the three subnetworks?

• 255.255.255.0

• 255.255.255.240

• 255.255.255.248

• 255.255.255.252

Multiple Choice

Refer to the exhibit. A company uses the address block of 128.107.0.0/16 for its network. What subnet mask would provide the maximum number of equal size subnets while providing enough host addresses for each subnet in the exhibit?

• 255.255.255.192

• 255.255.255.0

• 255.255.255.128

• 255.255.255.240

• 255.255.255.224

Multiple Select

Data is being sent from a source PC to a destination server. Which three statements correctly describe the function of TCP or UDP in this situation? (Choose three.)

• The source port field identifies the running application or service that will handle data returning to the PC.

• The TCP process running on the PC randomly selects the destination port when establishing a session with the server.

• UDP segments are encapsulated within IP packets for transport across the network.

• The UDP destination port number identifies the application or service on the server which will handle the data.

• TCP is the preferred protocol when a function requires lower network overhead.

Multiple Choice

What is an advantage to using a protocol that is defined by an open standard?

• A company can monopolize the market.

• The protocol can only be run on equipment from a specific vendor.

• An open standard protocol is not controlled or regulated by standards organizations.

• It encourages competition and promotes choices.

Multiple Choice

A user sends an HTTP request to a web server on a remote network. During encapsulation for this request, what information is added to the address field of a frame to indicate the destination?

• the network domain of the destination host

• the IP address of the default gateway

• the MAC address of the destination host

• the MAC address of the default gateway

Multiple Choice

Why would a Layer 2 switch need an IP address?

• to enable the switch to send broadcast frames to attached PCs

• to enable the switch to function as a default gateway

• to enable the switch to be managed remotely

• to enable the switch to receive frames from attached PCs

Multiple Choice

What characteristic describes a VPN?

• software on a router that filters traffic based on IP addresses or applications

• software that identifies fast-spreading threats

• a tunneling protocol that provides remote users with secure access into the network of an organization

• a network device that filters access and traffic coming into a network

Multiple Select

Which two statements describe features of an IPv4 routing table on a router? (Choose two.)​

• Directly connected interfaces will have two route source codes in the routing table: C and S .

• If there are two or more possible routes to the same destination, the route associated with the higher metric value is included in the routing table.

• The netstat -r command can be used to display the routing table of a router.​

• It stores information about routes derived from the active router interfaces.

• If a default static route is configured in the router, an entry will be included in the routing table with source code S .

Multiple Select

What are two functions that are provided by the network layer? (Choose two.)

• directing data packets to destination hosts on other networks

• placing data on the network medium

• carrying data between processes that are running on source and destination hosts

• providing dedicated end-to-end connections

• providing end devices with a unique network identifier

Multiple Select

Which two commands can be used on a Windows host to display the routing table? (Choose two.)

• netstat -s

• route print

• show ip route

• netstat -r

• tracert

Multiple Choice

Which information does the show startup-config command display?

• the IOS image copied into RAM

• the bootstrap program in the ROM

• the contents of the current running configuration file in the RAM

• the contents of the saved configuration file in the NVRAM

Multiple Select

What are three characteristics of the CSMA/CD process? (Choose three.)

• The device with the electronic token is the only one that can transmit after a collision.

• A device listens and waits until the media is not busy before transmitting.

• After detecting a collision, hosts can attempt to resume transmission after a random time delay has expired.

• All of the devices on a segment see data that passes on the network medium.

• A jam signal indicates that the collision has cleared and the media is not busy.

Multiple Choice

What is one main characteristic of the data link layer?

• It generates the electrical or optical signals that represent the 1 and 0 on the media.

• It converts a stream of data bits into a predefined code.

• It shields the upper layer protocol from being aware of the physical medium to be used in the communication.

• It accepts Layer 3 packets and decides the path by which to forward the packet to a remote network.

Multiple Select

Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)

• Destination IP addresses in a packet header remain constant along the entire path to a target host.

• Destination MAC addresses will never change in a frame that goes across seven routers.

• Every time a frame is encapsulated with a new destination MAC address, a new destination IP address is needed.

• Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.

• A packet that has crossed four routers has changed the destination IP address four times.

Multiple Choice

hat is a benefit of using cloud computing in networking?

• Technology is integrated into every-day appliances allowing them to interconnect with other devices, making them more ‘smart’ or automated.

• Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.

• End users have the freedom to use personal tools to access information and communicate across a business network.

• 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.

Multiple Choice

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?

• DD:DD:DD:DD:DD:DD

• CC:CC:CC:CC:CC:CC

• BB:BB:BB:BB:BB:BB

• AA:AA:AA:AA:AA:AA

• 172.168.10.65

Multiple Choice

What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?

• 255.255.255.0

• 255.255.255.240

• 255.255.255.128

• 255.255.255.192

• 255.255.255.224

Multiple Choice

An organization is assigned an IPv6 address block of 2001:db8:0:ca00::/56. How many subnets can be created without using bits in the interface ID space?

• 256

• 512

• 1024

• 4096

Multiple Choice

Two pings were issued from a host on a local network. The first ping was issued to the IP address of the default gateway of the host and it failed. The second ping was issued to the IP address of a host outside the local network and it was successful. What is a possible cause for the failed ping?

• The default gateway is not operational.

• The default gateway device is configured with the wrong IP address.

• Security rules are applied to the default gateway device, preventing it from processing ping requests.

• The TCP/IP stack on the default gateway is not working properly.

Multiple Choice

A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?

• It must send a DHCPv6 INFORMATION-REQUEST message to request the address of the DNS server.

• It must send a DHCPv6 REQUEST message to the DHCPv6 server to request permission to use this address.

• It must send an ICMPv6 Router Solicitation message to determine what default gateway it should use.

• It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.

Multiple Select

What two ICMPv6 message types must be permitted through IPv6 access control lists to allow resolution of Layer 3 addresses to Layer 2 MAC addresses? (Choose two.)

• neighbor solicitations

• echo requests

• neighbor advertisements

• router solicitations

• router advertisements

Multiple Choice

Which wireless technology has low-power and low-data rate requirements making it popular in IoT environments?

• Bluetooth

• Zigbee

• WiMAX

• Wi-Fi

Multiple Choice

Refer to the exhibit. The switches have a default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for the default gateway. Which network devices will receive the ARP request sent by host A?

• only host D

• only hosts B and C

• only hosts B, C, and router R1

• only hosts A, B, and C

• only router R1

Multiple Choice

What service is provided by DHCP?

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

• Allows remote access to network devices and servers.

• Dynamically assigns IP addresses to end and intermediary devices.

• Uses encryption to provide secure remote access to network devices and servers.

Multiple Choice

What characteristic describes an IPS?

• a tunneling protocol that provides remote users with secure access into the network of an organization

• a network device that filters access and traffic coming into a network

• software that identifies fast-spreading threats

• software on a router that filters traffic based on IP addresses or applications

Multiple Choice

A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?

• SSH

• SMB/CIFS

• HTTPS

• SLP

Multiple Choice

Which connector is used with twisted-pair cabling in an Ethernet LAN?

• LC conector

• SC conector

• BNC

• RJ 11

• RJ 45

Multiple Choice

Refer to the exhibit. A network engineer has been given the network address of 192.168.99.0 and a subnet mask of 255.255.255.192 to subnet across the four networks shown. How many total host addresses are unused across all four subnets?

• 88

• 200

• 72

• 224

• 158