fundementals of data communications

What type of network traffic requires QoS?

video conferencing

What command will prevent all unencrypted passwords from displaying in plain text in a configuration file?

(config)# service password-encryption

What type of communication rule would best describe CSMA/CD?

access method

What layer is responsible for routing messages through an internetwork in the TCP/IP model?

internet

Which switching method has the lowest level of latency?

fast-forward

What method can be used by two computers to ensure that packets are not dropped because too much data is being sent too quickly?

flow control

What are two examples of the cut-through switching method? (Choose two.)

fragment-free switching, fast-forward switching

Which PDU format is used when bits are received from the network medium by the NIC of a host?

frame

Which advantage does the store-and-forward switching method have compared with the cut-through switching method?

frame error checking

A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.)

-The latency that is created by the number of network devices that the data is crossing. - The amount of traffic that is currently crossing the network. -The type of traffic that is crossing the network.

Refer to the exhibit. What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1?

00-60-2F-3A-07-CC

Which is a multicast MAC address?

01-00-5E-00-00-03

What three blocks of addresses are defined by RFC 1918 for private network use? (Choose three.)

192.168.0.0/16 172.16.0.0/12 10.0.0.0/8

How many host addresses are available on the 192.168.10.128/26 network?

62

What is an advantage of network devices using open standard protocols?

A client host and a server running different operating systems can successfully exchange data.

Which statement describes the use of powerline networking technology?

A device connects to an existing home LAN using an adapter and an existing electrical outlet.

Which statement is true about the CSMA/CD access method that is used in Ethernet?

All network devices must listen before transmitting.

Which two host names follow the guidelines for naming conventions on Cisco IOS devices? (Choose two.)

SwBranch799 RM-3-Switch-2A4

What is a primary role of the Physical layer in transmitting data on the network?

Create the signals that represent the bits in each frame on to the media.

What three application layer protocols are part of the TCP/IP protocol suite? (Choose three.)

DNS FTP DHCP

What are three ways that media access control is used in networking? (Choose three.)

Data link layer protocols define the rules for access to different media. Ethernet utilizes CSMA/CD. Media access control provides placement of data frames onto the media.

Match the definitions to their respective CLI hot keys and shortcuts. (Not all options are used.)

Displays the next screen (space bar) Scrolls backwards through commands (Up Arrow) provides context-sensitive help (?) Completes abbreviated commands and parameters (Tab) Aborts commands such as trace and ping (Ctrl-Shift-6)

Which statement describes an extended star topology?

End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.

A web client is receiving a response for a web page from a web server. From the perspective of the client, what is the correct order of the protocol stack that is used to decode the received transmission?

Ethernet, IP, TCP, HTTP

Which media communication type does not require media arbitration in the data link layer?

full duplex

When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check?

CRC in the trailer

Refer to the graphic. What type of cabling is shown?

Fiber

An administrator is configuring a switch console port with a password. In what order will the administrator travel through the IOS modes of operation in order to reach the mode in which the configuration commands will be entered? (Not all options are used.)

First mode user EXEC mode Second mode privileged EXEC mode Third mode global configuration mode Final mode line configuration mode

What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?

Has a lower latency appropriate for high-performance computing applications​.

A user is implementing security on a small office network. Which two actions would provide the minimum security requirements for this network? (Choose two.)

Installing antivirus software Implementing a firewall

While trying to solve a network issue, a technician made multiple changes to the current router configuration file. The changes did not solve the problem and were not saved. What action can the technician take to discard the changes and work with the file in NVRAM?

Issue the reload command without saving the running configuration.

What function does pressing the Tab key have when entering a command in IOS?

It completes the remainder of a partially typed word in a command.

What is the auto-MDIX feature?

It enables a device to automatically configure an interface to use a straight-through or a crossover cable.

What are three characteristics of an SVI? (Choose three.)

It is associated with VLAN1 by default. It provides a means to remotely manage a switch. It is not associated with any physical interface on a switch.

What are two characteristics of fiber-optic cable? (Choose two.)

It is not affected by EMI or RFI. It is more expensive than UTP cabling is

Which two statements describe the services provided by the data link layer? (Choose two.)

It packages various Layer 3 PDUs into a frame format that is compatible with the network interface. It manages the access of frames to the network media.

What is a characteristic of the LLC sublayer?

It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.

Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer or discarded by the NIC? (Choose two.)

Minimum frame size Frame Check Sequence

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.

Network A - 192.168.0.128 /25 Network B - 192.168.0.0 /26 Network C - 192.168.0.96 /27 Network D - 192.168.0.80 /30

Match each characteristic to its corresponding Internet connectivity type. (Not all options are used.)

Not suited for heavily wooded areas. - satellite Uses coaxial cable as a medium. - cable Typically has a very low bandwidth. - dialup telephone High bandwidth connection that runs over telephone line. - DSL

For the TCP/IP protocol suite, what is the correct order of events when a Telnet message is being prepared to be sent over the network?

The IP header is added. (third) The TCP header is added. (second) The Ethernet header is added. (fourth) The Telnet-formatted data is provided to the next layer. (first)

Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)

Privileged EXEC mode Console interface VTY interface

How is SSH different from Telnet?

SSH provides security to remote sessions by encrypting messages and using user authentication. Telnet is considered insecure and sends messages in plaintext.

A technician configures a switch with these commands:SwitchA(config)# interface vlan 1SwitchA(config-if)# ip address 192.168.1.1 255.255.255.0SwitchA(config-if)# no shutdownWhat is the technician configuring?

SVI

Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?

Segments are sent from the transport layer to the internet layer.

Refer to the exhibit. ServerB is attempting to contact HostA. Which two statements correctly identify the addressing that ServerB will generate in the process? (Choose two.)

ServerB will generate a frame with the destination MAC address of RouterB. ServerB will generate a packet with the destination IP address of HostA. (sorry guys quizlet is a b*tch and wont let me add my own images >:( )

A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task?

Shared memory buffering

What three items are contained in an Ethernet header and trailer? (Choose three.)

Source MAC address Destination MAC address Error-checking information

Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?

Store-and-forward switching

A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection? (Choose three.)

The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. The link between the switches will work at the fastest speed that is supported by both switches. The link between switches will work as full-duplex.

What are two characteristics of RAM on a Cisco device? (Choose two.)

The configuration that is actively running on the device is stored in RAM The contents of RAM are lost during a power cycle

Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.

The data link layer uses LLC to communicate with the upper layers of the protocol suite. Logical link control is implemented in software.

What two criteria are used to help select a network medium from various network media? (Choose two.)

The environment where the selected medium is to be installed. The distance the selected medium can successfully carry a signal.

With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?

The magnetic field around the adjacent pairs of wire

After making configuration changes on a Cisco switch, a network administrator issues a copy running-config startup-config command. What is the result of issuing this command?

The new configuration will be loaded if the switch is restarted.

During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?

The physical address is added.

Which interface allows remote management of a Layer 2 switch?

The switch virtual interface

What is a characteristic of multicast messages?

They are sent to a select group of hosts.

Which statement is correct about network protocols?

They define how messages are exchanged between the source and the destination.

Which statement describes a characteristic of the frame header fields of the data link layer?

They vary depending on protocols.

A network administrator enters the service password-encryption command into the configuration mode of a router. What does this command accomplish?

This command prevents someone from viewing the running configuration passwords.

Match the description to the organization. (Not all options are used.)

This organization promotes the open development, evolution, and use of the Internet throughout the world. (ISOC) This organization promotes the open development, evolution, and use of the Internet throughout the world. (ISO) This organization is responsible for overseeing and managing IP address allocation, domain name management, and protocol identifiers. (IANA)

What is the purpose of the FCS field in a frame?

To determine if errors occurred in the transmission and reception.

An administrator uses the Ctrl-Shift-6 key combination on a switch after issuing the ping command. What is the purpose of using these keystrokes?

To interrupt the ping process

What is the function of the CRC value that is found in the FCS field of a frame?

To verify the integrity of the received frame.

Refer to the graphic. What type of cabling is shown?

UTP

What are two actions performed by a Cisco switch? (Choose two.)

Utilizing the MAC address table to forward frames via the destination MAC address. Using the source MAC addresses of frames to build and maintain a MAC address table.

In the show running-config command, which part of the syntax is represented by running-config ?

a keyword

What is contained in the trailer of a data-link frame?

error detection

Which command or key combination allows a user to return to the previous level in the command hierarchy?

exit

Which two OSI model layers have the same functionality as a single layer of the TCP/IP model? (Choose two.)

data link, physical

In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.)

electromagnetic interference, crosstalk

What process involves placing one PDU inside of another PDU?

encapsulation

Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)

header, data, trailer

An employee at a branch office is creating a quote for a customer. In order to do this, the employee needs to access confidential pricing information from internal servers at the Head Office. What type of network would the employee access?

intranet

Refer to the exhibit. A network administrator is configuring access control to switch SW1. If the administrator uses a console connection to connect to the switch, which password is needed to access user EXEC mode?

lineconin

Which two devices commonly affect wireless networks? (Choose two.)

microwaves, cordless phones

An administrator wants to create four subnetworks from the network address 192.168.1.0/24. What is the network address and subnet mask of the second useable subnet?

subnetwork 192.168.1.64 subnet mask 255.255.255.192

At which layer of the OSI model would a logical address be added during encapsulation?

network layer

A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?

partial mesh

Which method allows a computer to react accordingly when it requests data from a server and the server takes too long to respond?

response timeout

A networking technician is working on the wireless network at a medical clinic. The technician accidentally sets up the wireless network so that patients can see the medical records data of other patients. Which of the four network characteristics has been violated in this situation?

security

Match the requirements of a reliable network with the supporting network architecture. (Not all options are used.)

security - protects the network from unauthorized access Fault tolerance- Provide redundant links and devices. Scalability - expand the network without degrading the service for existing users

Which name is assigned to the transport layer PDU?

segment

What command is used to verify the condition of the switch interfaces, including the status of the interfaces and a configured IP address?

show ip interface brief

Which switching method uses the CRC value in a frame?

store-and-forward

When IPv4 addressing is manually configured on a web server, which property of the IPv4 configuration identifies the network and host portion for an IPv4 address?

subnet mask

What is the auto-MDIX feature on a switch?

the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection

How many bits must be borrowed from the host portion of an address to accommodate a router with five connected networks?

three