Data Communications and Networking 1 (Midterm)

  This course covers configuring and implementation of LAN networks.

Data Communications and Networking 1

Question 1

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Which two statements are true regarding the user EXEC mode? (Choose two.)

Select one or more:

a.

✔Only some aspects of the router configuration can be viewed

b.

Interfaces and routing protocols can be configured

c.

✔This is the default mode on an unconfigured router when first powered up

d.

Global configuration mode can be accessed by entering the enable command

e.

All router commands are available

Question 2

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When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?

Select one:

a.

Differentiated Services

b.

Flow Label

c.

Next Header

d.

Traffic Class

Question 3

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Which two statement describe broadcast transmissions on a wired network? (Choose two.)

Select one or more:

a.

Limited broadcasts are intended for local and remote hosts listening for a multicast packet

b.

Directed broadcasts are intended for all hosts on a local or remote network

c.

Limited broadcasts are only intended for the hosts on a local network

d.

Directed broadcast use the IP address of 255.255.255.255

e.

Limited broadcasts are forwarded by routers

Question 4

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Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

Select one:

a.

The client sets the window size for the session

b.

The client sends a synchronization segment to begin the session

c.

The client randomly selects a source port number

d.

The client sends an ISN to the server to start the 3-way handshake

Question 5

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A Answer address is defined as a reserved address that routes packets back to the host

Question 6

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For which three reasons was a packet switched connectionless data communications technology used when developing the Internet (Choose three.)

Select one or more:

a.

It requires that a data circuit between the source and destination be established before data can be transferred.

b.

Network devices dynamically decide on the best available path to forward each packet

c.

it allows for billing of network use by the amount of time a connection is established

d.

Data packets can travel through the network using multiple different paths

e.

it can rapidly adapt to the failure of network devices and communication links

Question 7

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What is and advantage of using standards to develop and implement protocols?

Select one:

a.

Different manufacturers are free to apply different requirements when implementing a protocol

b.

A particular protocol can be implemented by one manufacturer

c.

Products from different manufacturers can interoperate successfully

d.

Standards provide flexibility for manufacturers to create devices that comply with unique requirements

Question 8

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Your organization is issued the IPv6 prefix of 2001:0000:130F::/48 by your service provider. With this prefix, how many bits are available for your organization to create subnetworks?

Select one:

a.

128

b.

80

c.

16

d.

8

Question 9

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In which scenario would the use of a WISP be recommended

Select one:

a.

a farm in rural area without wired broadband access

b.

an Internet cafe in a city

c.

an apartment in a building with cable access to the Internet

d.

any home with multiple wireless devices

Question 10

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Which two components are added to the PDU at the network access layer? (Choose two.)

Select one or more:

a.

frame header

b.

Trailer

c.

HTTP header

d.

IP header

e.

TCP header

Question 11

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A data center has recently updated a physical server to host multiple operating systems on a single CPU. The data center can now provide each customer with a separate web server without having to allocate an actual discrete server for each customer. What is the network trend that is being implemented by the data center in this situation?

Select one:

a.

BYOD

b.

maintaining communication integrity

c.

virtualization

d.

online collaboration

Question 12

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What is an advantage of UDP over TCP?

Select one:

a.

UDP reorders segments that are received out of order

b.

UDP communication is more reliable

c.

UDP communication requires less overhead

d.

UDP acknowledges received data

Question 13

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An Answer is a private connection of LANs and WANs that belongs to an organization, and is designed to be accessible only by the members and employees of the organization, or others with authorization.

Question 14

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Which statement is true about an interface that is configured with the IPv6 address command?

Select one:

a.

IPv6 traffic-forwarding is enable on the interface

b.

A global unicast IPv6 address is dynamically configured on the interface

c.

A link-local IPv6 address is automatically

d.

Any IPv4 addresses that are assigned to the interface are replaced with an IPv6 address

Question 15

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A collision fragment, also known as a Answer frame, is a frame of fewer than 64 bytes in length.

Question 16

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A Answer network is able to expand to accept new devices and applications without affecting performance.

Question 17

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A user who is unable to connect to the file server contacts the help desk. The helpdesk technician asks the user to ping the IP address of the default gateway that is configured on the workstation. What is the purpose for this command?

Select one:

a.

to test if the workstation can communicate on the network

b.

to request the router to forward the connection request

c.

to obtain dynamic IP address from the server

d.

to resolve the domain name of the file server to its IP address

Question 17

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A user who is unable to connect to the file server contacts the help desk. The helpdesk technician asks the user to ping the IP address of the default gateway that is configured on the workstation. What is the purpose for this command?

Select one:

a.

to test if the workstation can communicate on the network

b.

to request the router to forward the connection request

c.

to obtain dynamic IP address from the server

d.

to resolve the domain name of the file server to its IP addres

Question 18

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Which three fields are used in a UDP segment header? (Choose three.)

Select one or more:

a.

Checksum

b.

Windows Size

c.

Length

d.

Source Port

e.

Acknowledgement Number

f.

Sequence Number

Question 19

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Which application use UDP as the transport layer protocol?

Select one:

a.

HTTP

b.

DHCP

c.

DNS queries

d.

Telnet

e.

SMTP

Question 20

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Which two files are loaded into RAM by the router when it boots? (Choose two.)

Select one or more:

a.

startup configuration

b.

running configuration

c.

POST

d.

bootsrap program

e.

IOS image

Question 21

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When a client connects to an HTTP server by the use of a randomly generated source port number, what destination port number will the HTTP server use when building a response?

Select one:

a.

the original source port number that was randomly generated by the client

b.

a randomly generated destination port number

c.

a destination port number of 80, referencing the service requested

d.

the original destination port number that was generated by the client

Question 22

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Which two functions or operations are performed by the MAC sublayer? (Choose two.)

Select one or more:

a.

it adds a header and trailer to form an OSI Layer 2 PDU

b.

It is responsible for Media Access Control

c.

it performs the function of NIC driver software

d.

it handles communication between upper and lower layers

e.

it adds control information to network protocol layer data

Question 23

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What will a network administrator use to modify a configuration on a Cisco router?

Select one:

a.

IOS

b.

a DHCP server

c.

a control panel

d.

the Windows command prompt

e.

Windows Explorer

Question 24

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Which term defines the processing capabilities of a switch by rating how much data can be processed per second?

Select one:

a.

forwarding rate

b.

form factor

c.

port density

d.

switching rate

Question 25

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The last host address on the 10.15.25.0/24 network is Answer

Question 26

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Which statement accurately describes public IP addresses?

Select one:

a.

Public IP addresses must be unique across the entire Internet

b.

Network administrators are free to select any public addresses to use for network devices that access the Internet

c.

Public IP addresses are only required to be unique within the local network

d.

Public addresses cannot be used within a private network

e.

Public addresses can be duplicated only within a local network

Question 27

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During the boot process, in what memory location will the router bootstrap program look for the IOS image if a TFTP server is not used?

Select one:

a.

flash

b.

ROM

c.

NVRAM

d.

RAM

Question 28

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Which entities are involved in a temporary communication that is established by the transport layer?

Select one:

a.

applications

b.

servers

c.

network media

d.

a host an intermediary device

e.

LAN

Question 29

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The shortest compressed format of the IPv6 address 2001: 0DB8:0000:1470:0000:0000:0000:0200 is 2001:DB8:0:1470::200

Question 30

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A user is unable to access the company server from a computer. On issuing the ipconfig command, the user finds that the IP address of the computer is displayed as 169.254.0.2. What type of address is this?

Select one:

a.

link-local

b.

experimental

c.

loopback

d.

private

Question 31

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A network administrator notices that the default gateway devices sends an ICMP Redirect message to the workstation when the workstation tries to connect to file server on another network. What is the purpose for this ICMP message?

Select one:

a.

To notify the workstation, that another router on the same network, is the better default-gateway to reach the remote server

b.

The default gateway does not know a route to the destination

c.

The network topology has changed and a new route toward the file server is available

d.

The default gateway is overwhelmed by network traffic and the request is redirected to another router

Question 32

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

Select one:

a.

Time-to-Live

b.

Fragment Offset

c.

Differentiated Services

d.

Header Length

Question 33

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How does the network layer use the MTU value?

Select one:

a.

To increase speed of delivery. The network layer ignores the MTU

b.

The network layer depends on the higher level layers to determine the MTU

c.

The network layer depends on the data link layer to set the MTU, and adjusts the speed of transmission to accommodate it

d.

The MTU is passed to the network layer by the data link layer

Question 34

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What happens if part of an FTP message is not delivered to the destination?

Select one:

a.

The FTP source host sends a query to the destination host

b.

The message is lost because FTP does not use a reliable delivery method

c.

The part of the FTP message that was lost is re-sent

d.

The entire FTP message is re-sent

Question 35

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

Select one or more:

a.

providing dedicated end-to-end connections

b.

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

c.

directing data packets to destination hosts on other networks

d.

placing data on the network medium

e.

providing end devices with a unique network identifier

Question 36

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Within a production network, what is the purpose of configuring a switch with a default gateway address?

Select one:

a.

Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination

b.

A switch mush have a default gateway to be accessible by Telnet and SSH

c.

The default gateway address is used to forward packets originating from the switch to remote networks.

d.

It provides a next-hop address for all traffic that flows through the switch

Question 36

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Within a production network, what is the purpose of configuring a switch with a default gateway address?

Select one:

a.

Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination

b.

A switch mush have a default gateway to be accessible by Telnet and SSH

c.

The default gateway address is used to forward packets originating from the switch to remote networks.

d.

It provides a next-hop address for all traffic that flows through the switch

Question 37

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Which feature on a Cisco router permits the forwarding of traffic for which there is no specific route?

Select one:

a.

outgoing interface

b.

next-hop

c.

gateway of last resort

d.

route source

Question 37

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Which feature on a Cisco router permits the forwarding of traffic for which there is no specific route?

Select one:

a.

outgoing interface

b.

next-hop

c.

gateway of last resort

d.

route source

Question 38

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Which statement describes a network that supports QoS?

Select one:

a.

The network should be able to expand to keep up with user demand

b.

Data sent over the network is not altered in transmission

c.

The network provides predictable levels of service to different types of traffic

d.

The fewest possible devices are affected by a failure

Question 39

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

Select one:

a.

(config) # service password-encryption

b.

(config)# enable password secret

c.

(config-line) # password secret

d.

(config) # enable secret Encrypted_Password

e.

(config) # enable secret Secret_Password

Question 40

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The 8-bit binary value for 41 is Answer

Question 41

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During troubleshooting procedures, from which location will most Cisco routers load a limited IOS

Select one:

a.

RAM

b.

ROM

c.

flash

d.

NVRAM

Question 42

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What is an advantage of using standards to develop and implement protocols?

Select one:

a.

Standard provide flexibility for manufacturers to create devices that comply with unique requirements

b.

A particular protocol can only be implemented by one manufacturer

c.

Products from different manufacturers can interoperate successfully

d.

Different manufacturers are free to apply different requirements when implementing a protoco

Question 43

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Which statement is correct about network protocols?

Select one:

a.

They define how messages are exchanged between the sources and the destination

b.

Network protocols define the type of hardware that is used and how it is mounted in racks

c.

They are only required for exchange of message between devices on remote network

d.

They all function in the network access layer of TCP/IP

Question 44

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On Ethernet networks, the hexadecimal address FF-FF-FF-FF-FF-FF represent the Answer MAC address.

Question 45

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Which destination address is used in an ARP request frame?

Select one:

a.

0.0.0.0

b.

255.255.255.255

c.

the physical address of the destination host

d.

AAAA.AAAA.AAAA

e.

FFFF.FFFF.FFFF

Question 46

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Which logical address is used for delivery of data to a remote network?

Select one:

a.

destination MAC address

b.

source IP address

c.

destination port number

d.

source MAC address

e.

destination IP address

Question 47

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Which number or set of numbers represents a socket?

Select one:

a.

21

b.

10.1.1.15

c.

01-23-45-67-89-AB

d.

192.168.1.1:80

Question 48

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Which type of IPv6 address is not routable and used for communication on a single subnet?

Select one:

a.

link-local address

b.

global unicast address

c.

unspecified address

d.

loopback address

e.

unique local address

Question 49

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What is the purpose of using a source port number in a TCP communication?

Select one:

a.

to assemble the segments that arrived out of order

b.

to keep track of multiple conversations between devices

c.

to notify the remote device that the conversation is over

d.

to inquire for a non received segment

Question 50

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What is the command netstat –r used for?

Select one:

a.

to release the assigned IP address

b.

to renew the default gateway

c.

to display the host routing table

d.

to display the TCP sockets