Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5

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Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5

Problem 1

Question :

Fill in the blank using a number.
The minimum Ethernet frame size is ____________ bytes.

Anything smaller than that should be considered a “runt frame.”

Correct Answer :

64

Explanation :

Refer to curriculum topic: 5.1.1
Ethernet II and IEEE 802.3 standards define the minimum frame size as 64 bytes and the maximum as 1518 bytes.

Problem 2

Question :

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?

Answer Option Choices :

port-based buffering
level 1 cache buffering
shared memory buffering
fixed configuration buffering

Correct Answer :

shared memory buffering

Explanation :

Refer to curriculum topic: 5.2.2
With shared memory buffering, the number of frames stored in the buffer is restricted only by the size of the entire memory buffer and not limited to a single port buffer. This permits larger frames to be transmitted with fewer dropped frames. This is important to asymmetric switching, which applies to this scenario, where frames are being exchanged between ports of different rates. With port-based memory buffering, frames are stored in queues that are linked to specific incoming and outgoing ports making it possible for a single frame to delay the transmission of all the frames in memory because of a busy destination port. Level 1 cache is memory used in a CPU. Fixed configuration refers to the port arrangement in switch hardware.

 

Problem 3

Question :

What type of address is 01-00-5E-0A-00-02?

Answer Option Choices :

an address that reaches every host inside a local subnet
an address that reaches one specific host

an address that reaches every host in the network

an address that reaches a specific group of hosts

Correct Answer :

an address that reaches a specific group of hosts

Explanation :

Refer to curriculum topic: 5.1.2
The multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. It allows a source device to send a packet to a group of devices.

 

Problem 4

Question :

What is the primary purpose of ARP?

Answer Option Choices :

translate URLs to IP addresses
resolve IPv4 addresses to MAC addresses
provide dynamic IP configuration to network devices
convert internal private addresses to external public addresses

Correct Answer :

resolve IPv4 addresses to MAC addresses

Explanation :

Refer to curriculum topic: 5.3.2

 

Problem 5

Question :

Fill in the blank.
On Ethernet networks, the hexadecimal address FF-FF-FF-FF-FF-FF represents the ____________MAC address.

Correct Answer :

broadcast
Broadcast
BROADCAST

Explanation :

Refer to curriculum topic: 5.1.2
On Ethernet networks, the broadcast MAC address is 48 binary ones displayed as hexadecimal FF-FF-FF-FF-FF-FF.

Problem 6

Question :

Fill in the blank.
The Ethernet ______________ sublayer is responsible for communicating directly with the physical layer.

Correct Answer :

MAC
Mac
mac

Explanation :

Refer to curriculum topic: 5.1.1
Ethernet at the data link layer is divided into two sublayers – the MAC and the LLC sublayers. The LLC sublayer is responsible for communicating with the upper layers, and the MAC sublayer communicates directly with the physical layer.

Problem 7

Question :

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

Answer Option Choices :

CRC in the trailer
source MAC address in the header
destination MAC address in the header
protocol type in the header

Correct Answer :

CRC in the trailer

Explanation :

Refer to curriculum topic: 5.2.2
The cyclic redundancy check (CRC) part of the trailer is used to determine if the frame has been modified during transit.​ If the integrity of the frame is verified, the frame is forwarded. If the integrity of the frame cannot be verified, then the frame is dropped.

Problem 8

Question :

Which action is taken by a Layer 2 switch when it receives a Layer 2 broadcast frame?

Answer Option Choices :

It drops the frame.
It sends the frame to all ports except the port on which it received the frame.
It sends the frame to all ports that are registered to forward broadcasts.
It sends the frame to all ports.

Correct Answer :

It sends the frame to all ports except the port on which it received the frame.

Explanation :

Refer to curriculum topic: 5.2.1
When a Layer 2 switch receives a frame with a broadcast destination address, it floods the frame to all ports except the port on which it received the frame.

Problem 9

Question :

Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5
Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5

 

 

 

 

 

 

 

 

 

 

 

Refer to the graphic. H2 has sent a broadcast message to all of the hosts. If host H1 wants to reply to the broadcast message, which statement is true?

Answer Option Choices :

H1 sends a unicast message to H2, but the switch forwards it to all devices.
H1 sends a unicast message to H2, and the switch forwards it directly to H2.
H1 sends a broadcast message to H2, and the switch forwards it to all devices.
H1 sends a multicast message to H2, and the switch forwards it directly to H2.

Correct Answer :

H1 sends a unicast message to H2, and the switch forwards it directly to H2.

Explanation :

Refer to curriculum topic: 5.2.1
Since H2 has just sent a broadcast message to all hosts, the MAC address for H2 is already in the switch MAC table. A unicast message from H1 to H2 will therefore be forwarded by the switch directly to H2.

 

Problem 10

Question :

Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5
Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5

 

 

 

 

 

 

 

 

 

 

 

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?

Answer Option Choices :

00-60-2F-3A-07-AA
00-60-2F-3A-07-BB
00-60-2F-3A-07-CC
00-60-2F-3A-07-DD

Correct Answer :

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

Explanation :

Refer to curriculum topic: 5.3.1
The destination MAC address is used for local delivery of Ethernet frames. The MAC (Layer 2) address changes at each network segment along the path. As the frame leaves the web server, it will be delivered by using the MAC address of the default gateway.

 

Problem 11

Question :

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

Answer Option Choices :

It is responsible for Media Access Control.
It performs the function of NIC driver software.
It adds a header and trailer to form an OSI Layer 2 PDU.
It handles communication between upper and lower layers.
It adds control information to network protocol layer data.

Correct Answer :

It is responsible for Media Access Control.
It adds a header and trailer to form an OSI Layer 2 PDU.

Explanation :

Refer to curriculum topic: 5.1.1
The MAC sublayer is the lower of the two data link sublayers and is closest to the physical layer. The two primary functions of the MAC sublayer are to encapsulate the data from the upper layer protocols and to control access to the media.

Problem 12

Question :

Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5
Cisco CCNA 1 Routing and Switching : Ethernet Chapter 5 Quiz 5

 

 

 

 

 

 

 

 

 

 

 

Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC3. In this scenario, what will happen next?

Answer Option Choices :

RT1 will forward the ARP request to PC3.
RT1 will send an ARP reply with its own Fa0/0 MAC address.
RT1 will send an ARP reply with the PC3 MAC address.
SW1 will send an ARP reply with its Fa0/1 MAC address.
RT1 will send an ARP reply with its own Fa0/1 MAC address.

Correct Answer :

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

Explanation :

Refer to curriculum topic: 5.3.2
When a network device has to communicate with a device on another network, it broadcasts an ARP request asking for the default gateway MAC address. The default gateway (RT1) unicasts an ARP reply with the Fa0/0 MAC address.

Problem 13

Question :

When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached?

Answer Option Choices :

fragment-free
fast-forward
cut-through
store-and-forward

Correct Answer :

store-and-forward

Explanation :

Refer to curriculum topic: 5.2.2
When the store-and-forward switching method is used, the switch receives the complete frame before forwarding it on to the destination. In contrast, a cut-through switch forwards the frame once the destination Layer 2 address is read.

Problem 14

Question :

What is the decimal equivalent of the hexadecimal value of 3F?

Answer Option Choices :

18
34
45
46
63

Correct Answer :

63

Explanation :

Refer to curriculum topic: 5.1.2
In order to convert a hexadecimal number to decimal, consider that the digit to the far right represents the 1s column where values 0 through F can appear. A hexadecimal value of A equals the decimal number 10. B equals 11, and so on through F equaling 15. The value of F in the number F equals 15. Next consider the value of 3 in the hexadecimal number of 3F. That place holder is the 16s column. Multiple the number 3 times 16 for a total of 48. Add 48 to 15 for the grand total of 63. Hexadecimal 3F equals a decimal value of 63.​

 

Problem 15

Question :

Fill in the blank.
The binary number 0000 1010 can be expressed as ______________ in hexadecimal.

Correct Answer :

0A
0a
A
a
0x0a
0x0A

Explanation :

Refer to curriculum topic: 5.1.2
The binary number 0000 1010 can be expressed as 0A in hexadecimal.

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