CCNA 1 Chapter 6 V4.0 Answers Updated 2012

1.Given the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this address?

This is a useable host address.

This is a broadcast address.

This is a network address.

This is not a valid address.

2.What is the network address of the host 172.25.67.99 /23 in binary?

10101100.00011001.01000011.00000000

10101100.00011001.01000011.11111111

10101100.00011001.01000010.00000000

10101100.00011001.01000010.01100011

10101100.00010001.01000011.01100010

10101100.00011001.00000000.00000000

3.Which IPv4 subnetted addresses represent valid host addresses? (Choose three.)

172.16.4.127 /26

172.16.4.155 /26

172.16.4.193 /26

172.16.4.95 /27

172.16.4.159 /27

172.16.4.207 /27

4.Refer to the exhibit. 

Host A is connected to the LAN, but it cannot get access to any resources on the Internet. The configuration of the host is shown in the exhibit. What could be the cause of the problem?

The host subnet mask is incorrect.

The default gateway is a network address.

The default gateway is a broadcast address.

The default gateway is on a different subnet from the host.

5.Refer to the exhibit.

A network administrator discovers that host A is having trouble with Internet connectivity, but the server farm has full connectivity. In addition, host A has full connectivity to the server farm. What is a possible cause of this problem?

The router has an incorrect gateway.

Host A has an overlapping network address.

Host A has an incorrect default gateway configured.

Host A has an incorrect subnet mask.

NAT is required for the host A network.

6.What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?

255.255.0.0

255.255.255.0

255.255.254.0

255.255.248.0


7.Refer to the exhibit. 

A network administrator has to develop an IP addressing scheme that uses the 192.168.1.0 /24 address space. The network that contains the serial link has already been addressed out of a separate range. Each network will be allocated the same number of host addresses. Which network mask will be appropriate to address the remaining networks?

255.255.255.248

255.255.255.224

255.255.255.192

255.255.255.240

255.255.255.128

255.255.255.252

8.What is a group of hosts called that have identical bit patterns in the high order bits of their addresses?

an internet

a network

an octet

a radix

9.Which process do routers use to determine the subnet network address based upon a given IP address and subnet mask?

binary adding

hexadecimal anding

binary division

binary multiplication

binary ANDing

10.What is the primary reason for development of IPv6?

security

header format simplification

expanded addressing capabilities

addressing simplification

11.Refer to the exhibit. 

Why would the response shown be displayed after issuing the command ping 127.0.0.1 on a PC?

The IP settings are not properly configured on the host.

Internet Protocol is not properly installed on the host.

There is a problem at the physical or data link layer.

The default gateway device is not operating.

A router on the path to the destination host has gone down.

12.Refer to the exhibit. 

The network administrator has assigned the internetwork of LBMISS an address range of 192.168.10.0. This address range has been subnetted using a /29 mask. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the new network (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the workgroup server's properties to allow connectivity to the network?

IP address: 192.168.10.38 subnet mask: 255.255.255.240 default gateway: 192.168.10.39

IP address: 192.168.10.38 subnet mask: 255.255.255.240 default gateway: 192.168.10.33

IP address: 192.168.10.38 subnet mask: 255.255.255.248 default gateway: 192.168.10.33

IP address: 192.168.10.39 subnet mask: 255.255.255.248 default gateway: 192.168.10.31

IP address: 192.168.10.254 subnet mask: 255.255.255.0 default gateway: 192.168.10.1

13.What two things will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away? (Choose two.)

The router will discard the packet.

The router will decrement the TTL value and forward the packet to the next router on the path to the destination host.

The router will send a time exceeded message to the source host.

The router will increment the TTL value and forward the packet to the next router on the path to the destination host.

The router will send an ICMP Redirect Message to the source host.

14.What three facts are true about the network portion of an IPv4 address? (Choose three.)

identifies an individual device

is identical for all hosts in a broadcast domain

is altered as packet is forwarded

varies in length

is used to forward packets

uses flat addressing

15.Which three IP addresses are private? (Choose three.)

172.168.33.1

10.35.66.70

192.168.99.5

172.18.88.90

192.33.55.89

172.35.16.5

16.Refer to the exhibit. 

Which network prefix will implement the IP addressing scheme for the LANs shown in the graphic?

/24

/16

/20

/27

/25

/28

17.A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?

172.16.0.0

172.16.192.0

172.16.192.128

172.16.192.160

172.16.192.168

172.16.192.176

18.How many bits make up an IPv4 address?

128

64

48

32

19.Which statements are true regarding IP addressing? (Choose two.)

NAT translates public addresses to private addresses destined for the Internet.

Only one company is allowed to use a specific private network address space.

Private addresses are blocked from public Internet by router.

Network 172.32.0.0 is part of the private address space.

IP address 127.0.0.1 can be used for a host to direct traffic to itself.

20.Which of the following are features of IPv6? (Choose three.)

larger address space

faster routing protocols

simplified header format

authentication and encryption

improved host naming conventions

same addressing scheme as IPv4


21.Which of the following network devices are recommended to be assigned static IP addresses? (Choose three.)

LAN workstations

servers

network printers

routers

remote workstations

laptops

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CCNA 1 Chapter 4 V4.0 Answers Updated 2012

1. After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?
13
53
80
1024
1728

2. Which information is found in both the TCP and UDP header information?
sequencing
flow control
acknowledgments
source and destination

3. Which is an important characteristic of UDP?
acknowledgement of data delivery
minimal delays in data delivery
high reliability of data delivery
same order data delivery

4. Why is flow control used for TCP data transfer?
to synchronize equipment speed for sent data
to synchronize and order sequence numbers so data is sent in complete numerical order
to prevent the receiver from being overwhelmed by incoming data
to synchronize window size on the server
to simplify data transfer to multiple hosts

5. During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?
The packets will not be delivered.
The packets will be retransmitted from the source.
The packets will be delivered and reassembled at the destination.
The packets will be delivered and not reassembled at the destination.

6. With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
0 to 255
256 to 1022
0 to 1023
1024 to 2047
49153 to 65535

7. Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
TCP
IP
UDP
HTTP
DNS

8. What are two features of the User Datagram Protocol (UDP)? (Choose two.)
flow control
low overhead
connectionless
connection-oriented
sequence and acknowledgements

9. What mechanism is used by TCP to provide flow control as segments travel from source to destination?
sequence numbers
session establishment
window size
acknowledgments

10. What is dynamically selected by the source host when forwarding data?
destination logical address
source physical address
default gateway address
source port

11. Why are port numbers included in the TCP header of a segment?
to indicate the correct router interface that should be used to forward a segment
to identify which switch ports should receive or forward the segment
to determine which Layer 3 protocol should be used to encapsulate the data
to enable a receiving host to forward the data to the appropriate application
to allow the receiving host to assemble the packet in the proper order

12. Which two options represent Layer 4 addressing? (Choose two.)
identifies the destination network
identifies source and destination hosts
identifies the communicating applications
identifies multiple conversations between the hosts
identifies the devices communicating over the local media

13. Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?
encapsulation
flow control
connectionless services
session establishment
numbering and sequencing
best effort delivery

14. Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
application
presentation
session
transport
network

15. Which event occurs during the transport layer three-way handshake?
The two applications exchange data.
TCP initializes the sequence numbers for the sessions.
UDP establishes the maximum number of bytes to be sent.
The server acknowledges the bytes of data received from the client.


16. Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two)

The local host is using three client sessions.
The local host is using web sessions to a remote server.
The local host is listening for TCP connections using public addresses.
The local host is using well-known port numbers to identify the source ports.
The local host is performing the three-way handshake with 192.168.1.101:1037.


17. Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

create a Layer 1 jam signal
reach a timeout and resend the data that needs to be acknowledged
send a RESET bit to the host
change the window size in the Layer 4 header

18. Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

session establishment
segment retransmit
data transfer
session disconnect


19. Refer to the exhibit. The initial TCP exchange of data between two hosts is shown in the exhibit. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?

2
3
6
1850
3431
3475


20. Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?

Host1 sends a segment with the ACK flag = 0, SYN flag = 0 to Host2.
Host1 sends a segment with the ACK flag = 1, SYN flag = 0 to Host2.
Host1 sends a segment with the ACK flag = 1, SYN flag = 1 to Host2.
Host2 sends a segment with the ACK flag = 0, SYN flag = 1 to Host1.
Host2 sends a segment with the ACK flag = 1, SYN flag = 0 to Host1.
Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.


21. Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)
This is a UDP header.

This contains a Telnet request.
This contains a TFTP data transfer.
The return packet from this remote host will have an Acknowledgement Number of 43693.
This is a TCP header.

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CCNA 1 Chapter 3 V4.0 Answers Updated 2012

1. What application layer protocol is commonly used to support for file transfers between a client and a server?

HTML

HTTP

FTP

Telnet
 

2. What are two forms of application layer software? (Choose two.)

applications

dialogs

requests

services

syntax

 

3. A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model? (Choose two.)

centralized administration

does not require specialized software

security is easier to enforce

lower cost implementation

provides a single point of failure
 

4. What is the purpose of resource records in DNS?

temporarily holds resolved entries

used by the server to resolve names

sent by the client to during a query

passes authentication information between the server and client
 

5. What is the automated service that matches resource names with the required IP address?

HTTP

SSH

FQDN

DNS

Telnet

SMTP
 

6. What three protocols operate at the Application layer of the OSI model? (Choose three.)

ARP

DNS

PPP

SMTP

POP

ICMP
 

7. What are three properties of peer-to-peer applications? (Choose three.)

acts as both a client and server within the same communication.

requires centralized account administration.

hybrid mode includes a centralized directory of files.

can be used in client-server networks.

requires a direct physical connection between devices.

centralized authentication is required.
 

8. Which application layer protocols correctly match a corresponding function? (Choose two.)

DNS dynamically allocates IP addresses to hosts

HTTP transfers data from a web server to a client

POP delivers email from the client to the server email server

SMTP supports file sharing

Telnet provides a virtual connection for remote access
 

9. Which email components are used to forward mail between servers? (Choose two.)

MDA

IMAP

MTA

POP

SMTP

MUA
 

10. As compared to SSH, what is the primary disadvantage of telnet?

not widely available

does not support encryption

consumes more network bandwidth

does not support authentication
 

11. Which statements are correct concerning the role of the MTA in handling email? (Choose three.)

routes email to the MDA on other servers

receives email from the client’s MUA

receives email via the POP3 protocol

passes email to the MDA for final delivery

uses SMTP to route email between servers

delivers email to clients via the POP3 protocol
 

12. Which two protocols are used to control the transfer of web resources from a web server to a client browser? (Choose two.)

ASP

FTP

HTML

HTTP

HTTPS

IP
 

13. A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type? (Choose two.)

User accounts are centralized.

Security is difficult to enforce.

Specialized operating system software is required.

File permissions are controlled by a single computer.

A computer that responds to a file sharing request is functioning as a server.
 

14. Which layer of the OSI model supplies services that allow user to interface with the network?

physical

session

network

presentation

application

transport

15. Refer to the exhibit. What is the destination port for the communication that is represented on line 5?

16. What are two characteristics of peer-to-peer networks? (Choose two.)

scalable

one way data flow

decentralized resources

centralized user accounts

resource sharing without a dedicated server
 

17. What application layer protocol describes the services that are used for file sharing in Microsoft networks?

DHCP

DNS

SMB

SMTP

Telnet
 

18. What are two characteristics of clients in data networks? (Choose two.)

use daemons

initiate data exchanges

are repositories of data

may upload data to servers

listen for requests from servers
 

19. What is the role of the OSI application layer?

provides segmentation of data

provides encryption and conversion of data

provides the interface between the applications on either end of the network

provides control of all the data flowing between the source and destination devices
 

20. How does the application layer on a server usually process multiple client request for services?

ceases all connections to the service

denies multiple connections to a single daemon

suspends the current connection to allow the new connection

uses support from lower layer functions to distinguish between connections to the service

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