exam

An administrator defined a local user account with a secret password on router R1 for use with SSH. Which three additional steps are required to configure R1 to accept only encrypted SSH connections?

Configure the IP domain name on the router.* Generate the SSH keys. Enable inbound vty SSH sessions.*

Which three layers of the OSI model map to the application layer of the TCP/IP model?

Application*, linksesión*, presentation*

What characteristic describes a DoS attack?

an attack that slows or crashes a device or network service

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, echo replies, router solicitations, router advertisements

neighbor solicitations, neighbor advertisements

What would be the interface ID of an IPv6 enabled interface with a MAC address of 1C-6F-65-C2-BD-F8 when the interface ID is generated by using the EUI-64 process? 0C6F:65FF:FEC2:BDF8, 1E6F:65FF:FEC2:BDF8, C16F:65FF:FEC2:BDF8, 106F:65FF:FEC2:BDF8

1E6F:65FF:FEC2:BDF8

What service is provided by SMTP?

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

Which type of server relies on record types such as A, NS, AAAA, and MX in order to provide services?

DNS

What service is provided by HTTP?

A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.

Which two traffic types use the Real-Time Transport Protocol (RTP)?

voice video

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

route print, netstat -r

What are three characteristics of the CSMA/CD process?

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.

What service is provided by FTP?

Allows for data transfers between a client and a file server.

What method is used to manage contention-based access on a wireless network? token passing CSMA/CA priority ordering CSMA/CD

CSMA/CA

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 network segments.

What happens when the transport input ssh command is entered on the switch vty lines?

Communication between the switch and remote users is encrypted

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

Destination IP addresses in a packet header remain constant along the entire path to a target host. Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.

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

IP addresses, Layer 1 statuses

What are two functions that are provided by the network layer?

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

Which two factors may interfere with the copper cabling and result in signal distortion and data corruption?

RFI​*EMI

How does the service password-encryption command enhance password security on Cisco routers and switches?

It encrypts passwords that are stored in router or switch configuration files.

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

What is one main characteristic of the data link layer?

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

What service is provided by BOOTP?

Legacy application that enables a diskless workstation to discover its own IP address and find a BOOTP server on the network.

Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network?

NAT introduces problems for some applications that require end-to-end connectivity. NAT provides a solution to slow down the IPv4 address depletion.

What is a benefit of using cloud computing in networking?

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

A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?

POP3

What service is provided by POP3?

Retrieves email from the server by downloading the email to the local mail application of the client.

A network administrator needs to keep the user ID, password, and session contents private when establishing remote CLI connectivity with a switch to manage it. Which access method should be chosen?

SSH

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?

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

A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?

TFTP

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 source port number that is used by each application.

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?

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

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

Time to live

What service is provided by HTTPS?

Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.

Which wireless technology has low-power and data rate requirements making it popular in home automation applications?

ZigBee*

What are three commonly followed standards for constructing and installing cabling?

cable lengths* pinouts* connector types

A user is attempting to access http://www.cisco.com/ without success. Which two configuration values must be set on the host to allow this access? DNS server source port number HTTP server source MAC address default Gateway

default Gateway, DNS server

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

enables IPv4 and IPv6 to utilize the same physical medium places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame

A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network?

interference, security coverage área

What does the term "attenuation" mean in data communication?

loss of signal strength as distance increases

What characteristic describes a Trojan horse?

malicious software or code running on an end device

What characteristic describes a virus?

malicious software or code running on an end device

Which two functions are performed at the MAC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?

places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame implements trailer with frame check sequence for error detection

What are proprietary protocols?

protocols developed by organizations who have control over their definition and operation

What is a function of the data link layer?

provides for the exchange of frames over a common local media

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

reconnaissance,

What characteristic describes an IPS?

software that identifies fast-spreading threats

What characteristic describes adware?

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

What characteristic describes spyware?

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

When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached? cut-through, store-and-forward, fast-forward, fragment-free

store-and-forward

Which switching method drops frames that fail the FCS check?

store-and-forward switching

What are two characteristics shared by TCP and UDP?

use of checksum port numbering

What two security solutions are most likely to be used only in a corporate environment?

virtual private networks, intrusion prevention systems

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 MAC address of the default gateway

The packet has a destination port number of 53. What service is the client requesting?

DNS

Why would a Layer 2 switch need an IP address?

To be managed remotly.

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

256

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

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

What attribute of a NIC would place it at the data link layer of the OSI model?

MAC address

Which two protocols operate at the top layer of the TCP/IP protocol suite?

POP, DNS

Which frame field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?

frame check sequence field

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

DHCP

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

Exit privileged EXEC mode and press Enter.

Which range of link-local addresses can be assigned to an IPv6-enabled interface? FEC0::/10, FDEE::/7, FE80::/10, FF00::/8

FE80::/10

A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?

FTP

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?

Fiber optic provides higher data capacity but is more expensive than copper cabling. Fiber optic cabling requires different termination and splicing expertise from what copper cabling requires.

A client packet is received by a server. The packet has a destination port number of 143. What service is the client requesting?

IMAP

What are the three parts of an IPv6 global unicast address? subnet ID subnet mask broadcast address global routing prefix interface ID

subnet ID global routing prefix interface ID

During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?

switch the packet to the directly connected interface

28. What technique is used with UTP cable to help protect against signal interference from crosstalk?

twisting the wires together into pairs

What is the purpose of the TCP sliding window?

To request that a source decrease the rate at which it transmits data

Which type of security threat would be responsible if a spreadsheet add-on disables the local software firewall? brute-force attack Trojan horse DoS buffer overflow

Trojan horse

What are two primary responsibilities of the Ethernet MAC sublayer? (Choose two.)

accessing the media, data encapsulation

An IPv6 enabled device sends a data packet with the destination address of FF02::2. What is the target of this packet?

all IPv6 configured routers on the local link

What characteristic describes antivirus software?

applications that protect end devices from becoming infected with malicious software