CCNA 1 R&S ITN Chapter 7 v5.0 Exam Answers 2014

1 
A PC is downloading a large file from a server. The TCP window is 1000 bytes. The server is sending the file using 100-byte segments. How many segments will the server send before it requires an acknowledgment from the PC?
1 segment
10 segments*
100 segments
1000 segments

2 
A host device needs to send a large video file across the network while providing data communication to other users. Which feature will allow different communication streams to occur at the same time, without having a single data stream using all available bandwidth?
multiplexing *
window size
acknowledgments
port numbers

3 
A technician wishes to use TFTP to transfer a large file from a file server to a remote router. Which statement is correct about this scenario?
The file is segmented and then reassembled in the correct order by TCP.
The file is not segmented, because UDP is the transport layer protocol that is used by TFTP.
Large files must be sent by FTP not TFTP.
The file is segmented and then reassembled in the correct order at the destination, if necessary, by the upper-layer protocol.*

4

5 
Which scenario describes a function provided by the transport layer?
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 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.
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 playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.

6 
Which transport layer feature is used to guarantee session establishment?
UDP ACK flag
TCP 3-way handshake*
UDP sequence number
TCP port number

7 
What is the complete range of TCP and UDP well-known ports?
0 to 255
256 – 1023
0 to 1023*
1024 – 49151

8 
Which two TCP header fields are used to confirm receipt of data?
checksum
acknowledgment number*
FIN flag
sequence number*
SYN flag

9 
​What is a beneficial feature of the UDP transport protocol?
acknowledgment of received data
tracking of data segments using sequence numbers
fewer delays in transmission*
the ability to retransmit lost data

10 
Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.)
RST
FIN
SYN*
ACK*
URG
PSH

11 
What happens if the first packet of a TFTP transfer is lost?
The TFTP application will retry the request if a reply is not received.*
The next-hop router or the default gateway will provide a reply with an error code.
The client will wait indefinitely for the reply.
The transport layer will retry the query if a reply is not received.

12 
Compared to UDP, what factor causes additional network overhead for TCP communication?
the identification of applications based on destination port numbers
the checksum error detection
the encapsulation into IP packets
network traffic that is caused by retransmissions*

13

14 
Which factor determines TCP window size?
the amount of data the destination can process at one time*
the number of services included in the TCP segment
the amount of data the source is capable of sending at one time
the amount of data to be transmitted

15

16 
During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?
the last sequence number that was sent by the source
one number more than the sequence number
the next byte that the destination expects to receive*
the total number of bytes that have been received

17 
What is a socket?
the combination of the source and destination sequence numbers and port numbers
the combination of the source and destination sequence and acknowledgment numbers
the combination of a source IP address and port number or a destination IP address and port number*
the combination of the source and destination IP address and source and destination Ethernet address

18 
Fill in the blank.
During a TCP session, the    ”SYN”   field is used by the client to request communication with the server.

19 
Fill in the blank using a number.

A total of   “4”    messages are exchanged during the TCP session termination process between the client and the server.

20 
A host device sends a data packet to a web server via the HTTP protocol. What is used by the transport layer to pass the data stream to the proper application on the server?
source port number
destination port number*
sequence number
acknowledgment

21 
What does a client do when it has UDP datagrams to send?
It just sends the datagrams.*
It queries the server to see if it is ready to receive data.
It sends a simplified three-way handshake to the server.
It sends to the server a segment with the SYN flag set to synchronize the conversation.

22 
What does a client application select for a TCP or UDP source port number?
a predefined value in the dynamic port range
a predefined value in the range of the registered ports
a predefined value in the well-known port range
a random value in the dynamic port range
a random value in the range of the registered ports*
a random value in the well-known port range

Read more ...

CCNA 1 R&S ITN Chapter 6 v5.0 Exam Answers 2014

1 
After troubleshooting a router, the network administrator wants to save the router configuration so that it will be used automatically the next time that the router reboots. What command should be issued?
copy startup-config flash
copy running-config flash
reload
copy startup-config running-config
copy running-config startup-config*

2 
Which IPv4 header field is responsible for defining the priority of the packet?​
traffic class
flow label
flags
differentiated services*
3 
When connectionless protocols are implemented at the lower layers of the OSI model, what are usually used to acknowledge the data receipt and request the retransmission of missing data?
Transport layer UDP protocols
upper-layer connection-oriented protocols*
connectionless acknowledgements
Network layer IP protocols
4 
Why is NAT not needed in IPv6?​
Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.​*
The end-to-end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.
Because IPv6 has integrated security, there is no need to hide the IPv6 addresses of internal networks.​
The problems that are induced by NAT applications are solved because the IPv6 header improves packet handling by intermediate routers.​

5

Refer to the exhibit. Fill in the blank.
A packet leaving PC-1 has to traverse “three” hops to reach PC-4.​

6 
Which two interfaces will allow access via the VTY lines to configure the router? (Choose two.)
console interfaces
USB interfaces
WAN interfaces*
LAN interfaces*
aux interfaces

7 
A technician is manually configuring a computer with the necessary IP parameters to communicate over the corporate network. The computer already has an IP address, a subnet mask, and a DNS server. What else has to be configured for Internet access?
the default gateway address*
the MAC address
the domain name of the organization
the WINS server address

8 
Which three commands are used to set up a password for a person who attaches a cable to a new router so that an initial configuration can be performed? (Choose three.)
password cisco *
line vty 0 4
line console 0 *
interface fastethernet 0/0
enable secret cisco
login * 

9

10

11 
Which statement about router interfaces is true?
Commands that apply an IP address and subnet mask to an interface are entered in global configuration mode.
Once the no shutdown command is given, a router interface is active and operational.
Router LAN interfaces are not activated by default, but router WAN interfaces are.
A configured and activated router interface must be connected to another device in order to operate.*

12 
A technician is configuring a router that is actively running on the network. Suddenly, power to the router is lost. If the technician has not saved the configuration, which two types of information will be lost? (Choose two.)
routing table*
ARP cache*
Cisco IOS image file
startup configuration
bootstrap file

13

14 
How do hosts ensure that their packets are directed to the correct network destination?
They always direct their packets to the default gateway, which will be responsible for the packet delivery.
They send a query packet to the default gateway asking for the best route.
They search in their own local routing table for a route to the network destination address and pass this information to the default gateway.
They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.​* 

15 
What is a service provided by the Flow Label field of the IPv6 header?
It identifies the total length of the IPv6 packet.
It limits the lifetime of a packet.
It informs network devices to maintain the same path for real-time application packets.*
It classifies packets for traffic congestion control.

16 
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?
look up the next-hop address for the packet
discard the traffic after consulting the route table
switch the packet to the directly connected interface*
analyze the destination IP address

17 
Fill in the blank.

In a router, “ROM ” is the nonvolatile memory where the diagnostic software, the bootup instructions, and a limited IOS are stored.

18 
Which two commands can be used on a Windows host to display the routing table? (Choose two.)
netstat -s
route print*
netstat -r*
tracert
show ip route

19 
A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?
The packet will be sent directly to the destination host.*
The packet will be sent only to the default gateway.
The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.
The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.

20 
Which command displays a summary chart of all router interfaces, their IP addresses, and their current operational status?
show interfaces
show version
show ip route
show ip interface brief *

21 
Which two files, if found, are copied into RAM as a router with the default configuration register setting boots up? (Choose two.)
POST diagnostics
running configuration
startup configuration*
IOS image file*

22

Open the PT Activity. Perform the tasks in the activity instructions and then answer the question or complete the task.

Does the router have enough RAM and flash memory to support the new IOS?
The router needs more RAM and more flash memory for the IOS upgrade.
The router has enough RAM, but needs more flash memory for the IOS upgrade.
The router has enough RAM and flash memory for the IOS upgrade.*
The router has enough flash memory, but needs more RAM for the IOS upgrade.

23 
When would the Cisco IOS image held in ROM be used to boot the router?
when the running configuration directs the router to do this
during a normal boot process
when the full IOS cannot be found*
during a file transfer operation

Read more ...

CCNA 1 R&S ITN Chapter 5 v5.0 Exam Answers 2014

1

2 
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?

It will send a request to the DNS server for the destination MAC address.

It will send an ARP request for the MAC address of the destination device.

It will send the frame and use its own MAC address as the destination.

It will send the frame with a broadcast MAC address.

It will send an ARP request for the MAC address of the default gateway.*

3 
Which address or combination of addresses does a Layer 3 switch use to make forwarding decisions?

MAC and IP addresses*

MAC address only

MAC and port addresses

port address only

IP address only

4 
What are two potential network problems that can result from ARP operation? (Choose two.)

Multiple ARP replies result in the switch MAC address table containing entries that match the MAC addresses of hosts that are connected to the relevant switch port.

On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.*

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.*

Manually configuring static ARP associations could facilitate ARP poisoning or MAC address spoofing.

Large numbers of ARP request broadcasts could cause the host MAC address table to overflow and prevent the host from communicating on the network.

5

Launch PT Hide and Save PT
Open the PT Activity. Perform the tasks in the activity instruction and then answer the question.

What destination address will PC1 include in the destination address field of the Ethernet frame that it sends to PC2?
00e0.b0be.8014

0030.a3e5.0401*

192.168.0.34

192.168.0.17

0007.ec35.a5c6

6 
How does adding an Ethernet line card affect the form factor of a switch?

by increasing the back plane switching speed

by expanding the port density*

by expanding the NVRAM capacity

by making the switch stackable

7 
Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved? (Choose two.)

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

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

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

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

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

8 
What is the Layer 2 multicast MAC address that corresponds to the Layer 3 IPv4 multicast address 224.139.34.56?

FE-80-00-0B-22-38

01-00-5E-0B-22-38*

FF-FF-FF-0B-22-38

00-00-00-0B-22-38

01-5E-00-0B-22-38

9 
What is the purpose of the preamble in an Ethernet frame?

is used to identify the destination address

is used to identify the source address

is used as a padding for data

is used for timing synchronization*

10 
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?

level 1 cache buffering

shared memory buffering*

fixed configuration buffering

port-based buffering

11 
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 connection will not be possible unless the administrator changes the cable to a crossover cable.

The duplex capability has to be manually configured because it cannot be negotiated.

If both switches support different speeds, they will each work at their own fastest speed.

The link between switches will work as full-duplex.*

The link between the switches will work at the fastest speed that is supported by both switches.*

12

Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?​

RT1 will send an ARP reply with its Fa0/0 MAC address.​

PC2 will send an ARP reply with its MAC address.*

RT1 will send an ARP reply with the PC2 MAC address.​

SW1 will send an ARP reply with its Fa0/1 MAC address.​

SW1 will send an ARP reply with the PC2 MAC address.​

13 
What is a characteristic of a contention-based access method?

It processes more overhead than the controlled access methods do.

It scales very well under heavy media use.

It is a nondeterministic method.*

It has mechanisms to track the turns to access the media.

14 
What statement illustrates a drawback of the CSMA/CD access method?

Collisions can decrease network performance.*

Deterministic media access protocols slow network performance.

CSMA/CD LAN technologies are only available at slower speeds than other LAN technologies.

It is more complex than non-deterministic protocols.
15 
When would a switch record multiple entries for a single switch port in its MAC address table?

when the switch is configured for Layer 3 switching

when another switch is connected to the switch port*

when a router is connected to the switch port

when multiple ARP broadcasts have been forwarded
16 
Which two statements describe a fixed configuration Ethernet switch? (Choose two.)

An SVI cannot be configured on the switch.

A fixed configuration switch may be stackable.*

The number of ports on the switch cannot be increased.*

The port density of the switch is determined by the Cisco IOS.

The switch cannot be configured with multiple VLANs.

17 
Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)

Logical link control is implemented in software.*

The LLC sublayer interacts directly with the NIC driver software.

The data link layer uses LLC to communicate with the upper layers of the protocol suite.*

The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.

Logical link control is specified in the IEEE 802.3 standard.
18 
A network administrator issues the following commands on a Layer 3 switch:

DLS1(config)# interface f0/3
DLS1(config-if)# no switchport
DLS1(config-if)# ip address 172.16.0.1 255.255.255.0
DLS1(config-if)# no shutdown
DLS1(config-if)# end

What is the administrator configuring?

a Cisco Express Forwarding instance

a routed port*

a trunk interface

a switched virtual interface

19 
Which statement is true about MAC addresses?

The first three bytes are used by the vendor assigned OUI.*

MAC addresses are implemented by software.

The ISO is responsible for MAC addresses regulations.

A NIC only needs a MAC address if connected to a WAN.

20

Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?

The switch will forward the frame to all ports.

The switch will forward the frame to all ports except port 4.*

The switch will forward the frame only to port 2.

The switch will discard the frame.

The switch will forward the frame only to ports 1 and 3.
21 
Fill in the blank.
The binary number 0000 1010 can be expressed as “A” in hexadecimal.
22 
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.*

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.

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.

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

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

23

Read more ...

CCNA 1 R&S ITN Chapter 4 v5.0 Exam Answers 2014

1 
What are two reasons for physical layer protocols to use frame encoding techniques? (Choose two.)

to identify where the frame starts and ends*

to distinguish data bits from control bits*

to reduce the number of collisions on the media

to increase the media throughput

to provide better media error correction

2 
Which statement is correct about multimode fiber?

Multimode fiber commonly uses a laser as a light source.

Multimode fiber cables carry signals from multiple connected sending devices.

SC-ST patch cords are used with multimode fiber cables.

SC-SC patch cords are used with multimode fiber cables.*

3 
Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?

data link*

application

transport

physical

4 
The throughput of a FastEthernet network is 80 Mb/s. The traffic overhead for establishing sessions, acknowledgments, and encapsulation is 15 Mb/s for the same time period. What is the goodput for this network?

15 Mb/s

55 Mb/s

65 Mb/s*

95 Mb/s

80 Mb/s

5 
A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption? (Choose two.)

RFI​ *

signal attenuation

crosstalk

EMI *

extended length of cabling

7 
What is the purpose of the FCS field in a frame?

to obtain the MAC address of the sending node

to verify the logical address of the sending node

to compute the CRC header for the data field

to determine if errors occurred in the transmission and reception*

8 
As data travels on the media in a stream of 1s and 0s how does a receiving node identify the beginning and end of a frame?​

The transmitting node sends an out-of-band signal to the receiver about the beginning of the frame.

The transmitting node sends a beacon to notify that a data frame is attached.

The receiving node identifies the beginning of a frame by seeing a physical address.

The transmitting node inserts start and stop bits into the frame.*

9 
Which statement describes signaling at the physical layer?

Sending the signals asynchronously means that they are transmitted without a clock signal.*

Signaling is a method of converting a stream of data into a predefined code.

Wireless encoding includes sending a series of clicks to delimit the frames.

In signaling, a 1 always represents voltage and a 0 always represents the absence of voltage.

10 
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? (Choose three.)

mobility options

extensive cabling

coverage area*

interference*

packet collision

security*

11 
What is one main characteristic of the data link layer?

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 a frame to a host on a remote network.

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

12 
What is one advantage of using fiber optic cabling rather than copper cabling?

It is easier to terminate and install than copper cabling.

It is able to be installed around sharp bends.

It is usually cheaper than copper cabling.

It is able to carry signals much farther than copper cabling.*
13 
Fill in the blank.
What acronym is used to reference the data link sublayer that identifies the network layer protocol encapsulated in the frame?
“LLC”

14 
Why are two strands of fiber used for a single fiber optic connection?

They allow for full-duplex connectivity.*

They prevent crosstalk from causing interference on the connection.

They increase the speed at which the data can travel.

The two strands allow the data to travel for longer distances without degrading.
15

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?​

1 – crossover, 2 – rollover, 3 – straight-through

1 – crossover, 2 – straight-through, 3 – rollover

1 – rollover, 2 – straight-through, 3 – crossover*

1 – rollover, 2 – crossover, 3 – straight-through
16 
What is true concerning physical and logical topologies?

Physical topologies display the IP addressing scheme of each network.

Logical topologies determine the media access control method used.*

Physical topologies are concerned with how a network transfers frames.

The logical topology is always the same as the physical topology.

17 
Fill in the blank.
The term “Bandwidth” indicates the capacity of a medium to carry data and it is typically measured in kilobits per second (kb/s) or megabits per second (Mb/s).​
18

Refer to the exhibit. What is wrong with the displayed termination?

The untwisted length of each wire is too long.*

The wires are too thick for the connector that is used.

The jack used is an RJ-11 connector instead of an RJ-45 connector.

The cable is not shielded.

19 
Fill in the blank with a number.
10,000,000,000 b/s can also be written as    ”10”     Gb/s.
20 
What are two characteristics of 802.11 wireless networks? (Choose two.)

Collisions can exist in the networks. *

They are collision-free networks.

They use CSMA/CD technology.

Stations can transmit at any time.

They use CSMA/CA technology.*

21 
A network administrator is required to upgrade wireless access to end users in a building. To provide data rates up to 1.3 Gb/s and still be backward compatible with older devices, which wireless standard should be implemented?

802.11n

802.11ac*

802.11g

802.11b
22 
How is the magnetic field cancellation effect enhanced in UTP cables?

by decreasing the number of wires that are used to carry data

by increasing the thickness of the PVC sheath that encases all the wires

by increasing and varying the number of twists in each wire pair*

by increasing the thickness of the copper wires

23
Match the steps to the physical layer operations that occur when data is sent from one node and received at another node.

Read more ...