CCNA (TCP/IP Question 19)

What is the address range of a Class B network address in binary?

A. 01xxxxxx

B. 0xxxxxxx

C. 10xxxxxx

D. 110xxxxx


Answer & Explanation
Answer: Option C

Explanation:

The range of a Class B network address is 128-191. This makes our binary range 10xxxxxx.

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CCNA (TCP/IP Question 18)

 
Which of the following protocols uses both TCP and UDP?

A. FTP

B. SMTP

C. Telnet

D. DNS



Answer & Explanation
Answer: Option D

Explanation:

DNS uses TCP for zone exchanges between servers and UDP when a client is trying to resolve a hostname to an IP address.

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CCNA (TCP/IP Question 17)

What protocol is used to find the hardware address of a local device?

A. RARP

B. ARP

C. IP

D. ICMP



Answer & Explanation
Answer: Option B

Explanation:

Address Resolution Protocol (ARP) is used to find the hardware address from a known IP address.

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CCNA (TCP/IP Question 16)

Which of the following are TCP/IP protocols used at the Application layer of the OSI model?

1. 
   
2. IP
3. TCP
4. Telnet
5. FTP
6. TFTP

A. 1 and 3

B. 1, 3 and 5

C. 3, 4 and 5

D. All of the above



Answer & Explanation
Answer: Option C

Explanation:

Telnet, File Transfer Protocol (FTP), and Trivial FTP (TFTP) are all Application layer protocols. IP is a Network layer protocol. Transmission Control Protocol (TCP) is a Transport layer protocol.

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CCNA (TCP/IP Question 15)

 
Which statements are true regarding ICMP packets?

1. ICMP guarantees datagram delivery.
2. ICMP can provide hosts with information about network problems.
3. ICMP is encapsulated within IP datagrams.
4. ICMP is encapsulated within UDP datagrams.

A. 1 only

B. 2 and 3

C. 1 and 4

D. All of the above



Answer & Explanation
Answer: Option B

Explanation:

ICMP is used for diagnostics and destination unreachable messages. ICMP is encapsulated within IP datagrams, and because it is used for diagnostics, it will provide hosts with information about network problems.

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CCNA (TCP/IP Question 14)

Which layer 4 protocol is used for a Telnet connection?

A. IP

B. TCP

C. TCP/IP

D. UDP


Answer & Explanation
Answer: Option B

Explanation:

Although Telnet does use TCP and IP (TCP/IP), the question specifically asks about layer 4, and IP works at layer 3. Telnet uses TCP at layer 4.

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CCNA (TCP/IP Question 13)

Which of the following are layers in the TCP/IP model?

1. Application
2. Session
3. Transport
4. Internet
5. Data Link
6. Physical

A. 1 and 2

B. 1, 3 and 4

C. 2, 3 and 5

D. 3, 4 and 5



Answer & Explanation
Answer: Option B

Explanation:

This seems like a hard question at first because it doesn't make sense. The listed answers are from the OSI model and the question asked about the TCP/IP protocol stack (DoD model). However, let's just look for what is wrong. First, the Session layer is not in the TCP/IP model; neither are the Data Link and Physical layers. This leaves us with the Transport layer (Host-to-Host in the DoD model), Internet layer (Network layer in the OSI), and Application layer (Application/Process in the DoD).

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CCNA (TCP/IP Question 12 )

Which statements are true regarding ICMP packets?

1. They acknowledge receipt of a TCP segment.
2. They guarantee datagram delivery.
3. They can provide hosts with information about network problems.
4. They are encapsulated within IP datagrams.

A. 1 only

B. 2 and 3

C. 3 and 4

D. 2, 3 and 4



Answer & Explanation
Answer: Option C

Explanation:

Internet Control Message Protocol (ICMP) is used to send error messages through the network, but they do not work alone. Every segment or ICMP payload must be encapsulated within an IP datagram (or packet).

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CCNA (TCP/IP Question 11 )

Which of the following is the decimal and hexadecimal equivalents of the binary number 10011101?

A. 155, 0x9B

B. 157, 0x9D

C. 159, 0x9F

D. 185, 0xB9



Answer & Explanation
Answer: Option B

Explanation:

To turn a binary number into decimal, you just have to add the values of each bit that is a 1. The values of 10011101 are 128, 16, 8, 4, and 1. 128 + 16 + 8 + 4 + 1 = 157.

Hexadecimal is a base-16 number system. The values of hexadecimal are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F-16 characters total, from which to create all the numbers you'll ever need. So, if 1001 in binary is 9, then the hexadecimal equivalent is 9. Since we then have 1101, which is 13 in binary, the hexadecimal answer is D and the complete hexadecimal answer is 0x9D.

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CCNA (TCP/IP Question 10 )

If you use either Telnet or FTP, which is the highest layer you are using to transmit data?

A. Application

B. Presentation

C. Session

D. Transport



Answer & Explanation
Answer: Option A

Explanation:

Both FTP and Telnet use TCP at the Transport layer; however, they both are Application layer protocols, so the Application layer is the best answer.

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CCNA (TCP/IP Question 9 )

Which class of IP address provides a maximum of only 254 host addresses per network ID?

A. Class A

B. Class B

C. Class C

D. Class D




Answer & Explanation
Answer: Option C

Explanation:

A Class C network address has only 8 bits for defining hosts: 28 - 2 = 254.

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CCNA (TCP/IP Question 8 )

Which of the following services use UDP?

1. DHCP
2. SMTP
3. SNMP
4. FTP
5. HTTP
6. TFTP

A. 1, 3 and 6

B. 2 and 4

C. 1, 2 and 4

D. All of the above



Answer & Explanation
Answer: Option A

Explanation:

DHCP, SNMP, and TFTP use UDP.

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CCNA (TCP/IP Question 7 )

The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI model?

A. Application

B. Host-to-Host

C. Internet

D. Network Access



Answer & Explanation
Answer: Option C

Explanation:

The four layers of the DoD model are Application/Process, Host-to-Host, Internet, and Network Access. The Internet layer is equivalent to the Network layer of the OSI model.

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CCNA (TCP/IP Question 6 )

Which of the following allows a router to respond to an ARP request that is intended for a remote host?

A. Gateway DP

B. Reverse ARP (RARP)

C. Proxy ARP

D. Inverse ARP (IARP)



Answer & Explanation
Answer: Option C

Explanation:

Proxy ARP can help machines on a subnet reach remote subnets without configuring routing or a default gateway.

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CCNA (TCP/IP Question 5 )

Which of the following is private IP address?

A. 12.0.0.1

B. 168.172.19.39

C. 172.15.14.36

D. 192.168.24.43



Answer & Explanation
Answer: Option D

Explanation:

Class A private address range is 10.0.0.0 through 10.255.255.255. Class B private address range is 172.16.0.0 through 172.31.255.255, and Class C private address range is 192.168.0.0 through 192.168.255.255.

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CCNA (TCP/IP Question 4 )

You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you use to accomplish this?

A. SMTP

B. SNMP

C. DHCP

D. ARP



Answer & Explanation
Answer: Option C

Explanation:

Dynamic Host Configuration Protocol (DHCP) is used to provide IP information to hosts on your network. DHCP can provide a lot of information, but the most common is IP address, subnet mask, default gateway, and DNS information.

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CCNA (TCP/IP Question 3 )

Which of the following describe the DHCP Discover message?

• It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.
• It uses UDP as the Transport layer protocol.
• It uses TCP as the Transport layer protocol.
• It does not use a layer 2 destination address.

A. 1 only

B. 1 and 2

C. 3 and 4

D. 4 only



Answer & Explanation
Answer: Option B

Explanation:

A client that sends out a DHCP Discover message in order to receive an IP address sends out a broadcast at both layer 2 and layer 3. The layer 2 broadcast is all Fs in hex, or FF:FF:FF:FF:FF:FF. The layer 3 broadcast is 255.255.255.255, which means all networks and all hosts. DHCP is connectionless, which means it uses User Datagram Protocol (UDP) at the Transport layer, also called the Host-to-Host layer.

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CCNA (TCP/IP Question 2 )

What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model?

A. Application

B. Host-to-Host

C. Internet

D. Network Access



Answer & Explanation
Answer: Option B

Explanation:

The four layers of the TCP/IP stack (also called the DoD model) are Application/Process, Host-to-Host, Internet, and Network Access. The Host-to-Host layer is equivalent to the Transport layer of the OSI model.

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CCNA (TCP/IP Question 1 )

Which of the following services use TCP?

• DHCP
• SMTP
• HTTP
• TFTP
• FTP

A. 1 and 2

B. 2, 3 and 5

C. 1, 2 and 4

D. 1, 3 and 4

Answer & Explanation
Answer: Option B

Explanation:

SMTP, HTTP and FTP use TCP.

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CCNA ( Network Basic Question 33 )

What protocols are used to configure trunking on a switch?

• VLAN Trunking Protocol
• VLAN
• 802.1Q
• ISL

A. 1 and 2

B. 3 and 4

C. 1 only

D. 2 only



Answer & Explanation
Answer: Option B

Explanation:

VTP is not right because it has nothing to do with trunking except that it sends VLAN information across a trunk link. 802.1Q and ISL are used to configure trunking on a port.

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CCNA ( Network Basic Question 32 )

If you wanted to delete the configuration stored in NVRAM, what would you type?

A. erase startup

B. erase nvram

C. delete nvram

D. erase running

Answer & Explanation
Answer: Option A

Explanation:

The command erase startup-config deletes the configuration stored in NVRAM.

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CCNA ( Network Basic Question 31 )

Which command is used to upgrade an IOS on a Cisco router?

A. copy tftp run

B. copy tftp start

C. config net

D. copy tftp flash





Answer & Explanation
Answer: Option D

Explanation:

The copy tftp flash command places a new file in flash memory, which is the default location for the Cisco IOS in Cisco routers.


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CCNA ( Network Basic Question 30 )

Which protocol does Ping use?

A. TCP

B. ARP

C. ICMP

D. BootP



Answer & Explanation
Answer: Option C

Explanation:

ICMP is the protocol at the Network layer that is used to send echo requests and replies.




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CCNA ( Network Basic Question 29 )

 
What command will display the line, protocol, DLCI, and LMI information of an interface?

A. sh pvc

B. show interface

C. show frame-relay pvc

D. show run



Answer & Explanation
Answer: Option B

Explanation:


The show interface command shows the line, protocol, DLCI, and LMI information of an interface.




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CCNA ( Network Basic Question 28 )

How many collision domains are created when you segment a network with a 12-port switch?

A. 1

B. 2

C. 5

D. 12




Answer & Explanation
Answer: Option D

Explanation:

Layer 2 switching creates individual collision domains.

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CCNA ( Network Basic Question 27 )

What is the main reason the OSI model was created?

A. To create a layered model larger than the DoD model.

B. So application developers can change only one layer's protocols at a time.

C. So different networks could communicate.

D. So Cisco could use the model.



Answer & Explanation
Answer: Option C

Explanation:

The primary reason the OSI model was created was so that different networks could inter-operate.




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CCNA ( Network Basic Question 26 )

What does a VLAN do?

A. Acts as the fastest port to all servers.

B. Provides multiple collision domains on one switch port.

C. Breaks up broadcast domains in a layer 2 switch internetwork.

D. Provides multiple broadcast domains within a single collision domain.



Answer & Explanation
Answer: Option C

Explanation:

VLANs break up broadcast domains at layer 2.

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CCNA ( Network Basic Question 25 )

Which one of the following is true regarding VLANs?

A. Two VLANs are configured by default on all Cisco switches.

B. VLANs only work if you have a complete Cisco switched internetwork. No off-brand switches are allowed.
C. You should not have more than 10 switches in the same VTP domain.

D. VTP is used to send VLAN information to switches in a configured VTP domain.

Answer & Explanation
Answer: Option D




Explanation:

Switches do not propagate VLAN information by default; you must configure the VTP domain. VLAN Trunking Protocol (VTP) is used to propagate VLAN information across a trunk link.


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CCNA ( Network Basic Question 24 )

If your router is facilitating a CSU/DSU, which of the following commands do you need to use to provide the router with a 64000bps serial link?

A. RouterA(config)#bandwidth 64

B. RouterA(config-if)#bandwidth 64000

C. RouterA(config-if)#clock rate 64

D. RouterA(config-if)#clock rate 64000



Answer & Explanation
Answer: Option D

Explanation:

The clock rate command is two words, and the speed of the line is in bps.


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CCNA ( Network Basic Question 23 )

What is a stub network?

A. A network with more than one exit point.

B. A network with more than one exit and entry point.

C. A network with only one entry and no exit point.

D. A network that has only one entry and exit point.



Answer & Explanation
Answer: Option D

Explanation:

Stub networks have only one connection to an internetwork. Only default routes can be set on a stub network or network loops may occur.


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CCNA ( Network Basic Question 22 )

What PPP protocol provides dynamic addressing, authentication, and multilink?

A. NCP

B. HDLC

C. LCP

D. X.25


Answer & Explanation
Answer: Option C

Explanation:

Link Control Protocol in the PPP stack provides dynamic addressing, authentication, and multilink.

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CCNA ( Network Basic Question 21 )

 
In a network with dozens of switches, how many root bridges would you have?

A. 1

B. 2

C. 5

D. 12


Answer & Explanation
Answer: Option A

Explanation:

You should have only one root bridge per network.

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CCNA ( Network Basic Question 20 )

 
Which class of IP address has the most host addresses available by default?

A. A

B. B

C. C

D. A and B


Answer & Explanation
Answer: Option A

Explanation:

Class A addressing provides 24 bits for host addressing.

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CCNA ( Network Basic Question 19 )

Which router command allows you to view the entire contents of all access lists?

A. show all access-lists

B. show access-lists

C. show ip interface

D. show interface



Answer & Explanation
Answer: Option B

Explanation:

To see the contents of all access lists, use the show access-lists command.

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CCNA ( Network Basic Question 18 )

What does the command routerA(config)#line cons 0 allow you to perform next?



A. Set the Telnet password.

B. Shut down the router.

C. Set your console password.

D. Disable console connections.

Answer & Explanation
Answer: Option C

Explanation:

The command line console 0 places you at a prompt where you can then set your console user-mode password.

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CCNA ( Network Basic Question 17 )

How many broadcast domains are created when you segment a network with a 12-port switch?

A. 1

B. 2

C. 5

D. 12

Answer & Explanation
Answer: Option A

Explanation:

By default, switches break up collision domains but are one large broadcast domain.

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CCNA ( Network Basic Question 16 )

 
How often are BPDUs sent from a layer 2 device?

A. Never

B. Every 2 seconds

C. Every 10 minutes

D. Every 30 seconds





Answer & Explanation
Answer: Option B

Explanation:

Every 2 seconds, BPDUs are sent out from all active bridge ports by default.

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