Can You Pass This Hardest Test Of CCNA Networking Exam?
CCNA is a complex exam related to the Cisco Certified Network Associate Routing & Switching certification. This exam tests a candidate's knowledge and skills required to install, operate, and troubleshoot an enterprise's branch network. So, let's try out the quiz. All the best!
- 1.
What are the functions of a Layer 2 Ethernet switch? (Choose three.)
- A.
Preventing broadcasts
- B.
Increasing available bandwidth per user
- C.
Decreasing the size of collision domains
- D.
Isolating traffic among segments
- E.
Routing traffic between different networks
Correct Answer(s)
B. Increasing available bandwidth per user
C. Decreasing the size of collision domains
D. Isolating traffic among segmentsExplanation
A Layer 2 Ethernet switch performs three functions. Firstly, it increases the available bandwidth per user by providing dedicated connections for each device connected to it. Secondly, it decreases the size of collision domains by creating separate collision domains for each port, reducing the chances of collisions and improving network performance. Lastly, it isolates traffic among segments by forwarding packets only to the intended destination, enhancing network security and efficiency.Rate this question:
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- 2.
Why does a switch have higher throughput compared to a bridge?
- A.
Switching occurs in software.
- B.
Switching occurs in hardware.
- C.
Switches create multiple broadcast domains.
- D.
Switches segment LANs.
Correct Answer
B. Switching occurs in hardware.Explanation
A switch has higher throughput compared to a bridge because switching occurs in hardware. Unlike bridges which use software-based switching, switches have dedicated hardware components that allow for faster and more efficient data transfer. This hardware-based switching enables switches to process and forward data packets at a much higher speed, resulting in increased throughput. By utilizing hardware resources, switches can handle higher volumes of network traffic and provide better performance compared to bridges.Rate this question:
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- 3.
Why would a network administrator segment a network with a Layer 2 switch? (Choose two.)
- A.
To create fewer collision domains
- B.
To enhance user bandwidth
- C.
To create more broadcast domains
- D.
To isolate traffic between segments
- E.
To isolate ARP request messages from the rest of the network
Correct Answer(s)
B. To enhance user bandwidth
D. To isolate traffic between segmentsExplanation
A network administrator would segment a network with a Layer 2 switch to enhance user bandwidth by dividing the network into smaller segments, reducing congestion and improving overall network performance. Additionally, segmenting the network with a Layer 2 switch allows the administrator to isolate traffic between segments, providing better security and control over network traffic flow.Rate this question:
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- 4.
Refer to the graphic. Which point must be reached before a frame is forwarded when the switch is using store-and-forward mode?
- A.
A
- B.
B
- C.
C
- D.
E
- E.
F
Correct Answer
E. FExplanation
In store-and-forward mode, the switch waits to receive the entire frame before forwarding it. This ensures that the frame is error-free and complete before being transmitted. Therefore, before a frame is forwarded, it must reach point F, which represents the end of the frame.Rate this question:
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- 5.
Hubs are concerned with which PDU?
- A.
Bits
- B.
Frames
- C.
Packets
- D.
Datagrams
Correct Answer
A. BitsExplanation
Hubs are concerned with bits. A hub is a basic networking device that connects multiple devices in a network. It operates at the physical layer of the OSI model, which deals with the transmission of raw data in the form of bits over a communication channel. Hubs simply receive incoming bits from one port and broadcast them to all other ports. They do not analyze or interpret the data at higher layers, such as frames, packets, or datagrams. Therefore, the correct answer is bits.Rate this question:
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- 6.
Which statements are true regarding hubs? (Choose three.)
- A.
Hubs operate at Layer 1 of the OSI model.
- B.
They create separate collision domains.
- C.
Signals are distributed through all ports.
- D.
Layer 2 addresses are used to make decisions.
- E.
Bandwidth is shared among all connected users.
Correct Answer(s)
A. Hubs operate at Layer 1 of the OSI model.
C. Signals are distributed through all ports.
E. Bandwidth is shared among all connected users.Explanation
Hubs operate at Layer 1 of the OSI model because they are physical devices that simply transmit signals between connected devices. Signals are distributed through all ports on a hub, meaning that any signal received by the hub is transmitted out to all connected devices. Additionally, bandwidth is shared among all connected users on a hub, meaning that the total available bandwidth is divided among all devices connected to the hub. Layer 2 addresses are not used to make decisions on a hub, as hubs do not have the ability to analyze or interpret layer 2 addresses.Rate this question:
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- 7.
Which device provides segmentation within a single network?
- A.
Hub
- B.
Server
- C.
Switch
- D.
Transceiver
Correct Answer
C. SwitchExplanation
A switch is a device that provides segmentation within a single network. It operates at the data link layer of the OSI model and uses MAC addresses to forward data packets to the intended recipient. Unlike a hub, which broadcasts data to all connected devices, a switch intelligently directs data only to the device it is intended for, thereby reducing network congestion and improving overall network performance. A server is a device that provides various services to clients, and a transceiver is a device used for transmitting and receiving data.Rate this question:
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- 8.
Which of the following is a Layer 2 broadcast address?
- A.
0.0.0.0
- B.
255.255.255.255
- C.
11:11:11:11
- D.
FF:FF:FF:FF
- E.
FF:FF:FF:FF:FF:FF
Correct Answer
E. FF:FF:FF:FF:FF:FFExplanation
The correct answer is FF:FF:FF:FF:FF:FF. This is the Layer 2 broadcast address, which is used to send a message to all devices on a network. When a device sends a message to this address, it is received by all devices on the network.Rate this question:
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- 9.
Refer to the graphic. Which point in the frame must be reached before it is forwarded by a switch that is using fast-forward mode?
- A.
A
- B.
B
- C.
C
- D.
E
- E.
F
Correct Answer
C. CExplanation
In fast-forward mode, a switch forwards a frame as soon as it receives the destination MAC address. Looking at the graphic, point C represents the destination MAC address. Therefore, point C must be reached before the frame is forwarded by a switch using fast-forward mode.Rate this question:
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- 10.
Which switching mode changes to store-and-forward mode after it detects a given number of errors?
- A.
Cut-through
- B.
Adaptive fast-forward
- C.
Fragment-free
- D.
Adaptive cut-through
Correct Answer
D. Adaptive cut-throughExplanation
The switching mode that changes to store-and-forward mode after it detects a given number of errors is adaptive cut-through. This mode initially uses cut-through switching, where it forwards packets as soon as the destination address is received, without checking for errors. However, if a certain number of errors are detected, it switches to store-and-forward mode, which involves receiving the entire packet, checking for errors, and then forwarding it. This adaptive approach helps to ensure better data integrity and reduce the chances of transmitting erroneous packets.Rate this question:
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- 11.
Which form of buffering is used by bridges?
- A.
Cut-through
- B.
Fragment-free
- C.
Fast-forward
- D.
Store-and-forward
Correct Answer
D. Store-and-forwardExplanation
Bridges use the store-and-forward form of buffering. In this method, the bridge receives the entire frame before forwarding it to the destination. It checks the frame for errors and can also perform filtering or other operations on it. This buffering technique ensures that the entire frame is error-free before it is forwarded, reducing the chances of transmitting corrupted data.Rate this question:
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- 12.
Where are switching tables stored in a Cisco LAN switch?
- A.
ROM
- B.
CAM
- C.
Flash
- D.
SIMM
- E.
NRAM
Correct Answer
B. CAMExplanation
Switching tables in a Cisco LAN switch are stored in the Content Addressable Memory (CAM). CAM is a type of memory that allows for fast lookups and retrieval of information. In the case of a LAN switch, the CAM stores the MAC addresses and corresponding port information for each device connected to the switch. This allows the switch to quickly determine the destination port for incoming frames and efficiently forward them to the appropriate device.Rate this question:
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- 13.
Which of the following are true regarding the addition of switches to a network? (Choose two.)
- A.
They increase the number of collision domains.
- B.
They decrease the number of collision domains.
- C.
They increase the number of broadcast domains.
- D.
They increase the amount of bandwidth available to users.
- E.
They decrease the amount of bandwidth available to users.
Correct Answer(s)
B. They decrease the number of collision domains.
D. They increase the amount of bandwidth available to users.Explanation
Adding switches to a network decreases the number of collision domains because switches create separate collision domains for each port, reducing the likelihood of collisions. Additionally, adding switches increases the amount of bandwidth available to users since switches provide dedicated bandwidth for each port, allowing for simultaneous data transmission.Rate this question:
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- 14.
Which of the following is used to build a switching table?
- A.
Source IP addresses
- B.
Destination IP addresses
- C.
Destination MAC addresses
- D.
Source MAC addresses
Correct Answer
D. Source MAC addressesExplanation
A switching table is used in network switches to determine the destination of incoming data packets. It maps the source MAC addresses of the packets to the corresponding switch ports. This allows the switch to forward the packets to the correct destination without flooding the entire network. Therefore, the source MAC addresses are used to build a switching table.Rate this question:
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- 15.
Which statements describe asymmetric switching? (Choose three.)
- A.
It uses data compression algorithms to manage higher bandwidth interfaces.
- B.
It is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces.
- C.
It provides connections between network segments that operate at different bandwidths.
- D.
It uses cut-through forwarding when going from a lower bandwidth to a higher bandwidth interface.
- E.
It may require buffering frames before forwarding to the destination interface.
Correct Answer(s)
B. It is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces.
C. It provides connections between network segments that operate at different bandwidths.
E. It may require buffering frames before forwarding to the destination interface.Explanation
Asymmetric switching is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces. It also provides connections between network segments that operate at different bandwidths. Additionally, it may require buffering frames before forwarding them to the destination interface.Rate this question:
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- 16.
What does switch latency describe?
- A.
Forwarding method used by a switch
- B.
Time it takes for a frame to be received by a switch
- C.
Improvement in network performance from using a switch
- D.
Time delay between when a frame enters and exits a switch
- E.
Increase in the size of a collision domain from using a switch
Correct Answer
D. Time delay between when a frame enters and exits a switchExplanation
Switch latency describes the time delay between when a frame enters and exits a switch. It refers to the amount of time it takes for a switch to process and forward a frame from one port to another. This delay can be affected by various factors such as the switch's processing power, the size of the forwarding table, and the congestion level in the network. By minimizing switch latency, network performance can be improved as frames can be quickly and efficiently forwarded within the network.Rate this question:
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- 17.
How does an Ethernet bridge handle an incoming frame? (Choose three.)
- A.
The source MAC address and input interface pair are added to the bridging table.
- B.
The destination MAC address and input interface pair are added to the bridging table.
- C.
If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces.
- D.
If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface.
- E.
If a match to the source MAC address is found in the bridging table, the frame is forwarded to all ports.
Correct Answer(s)
A. The source MAC address and input interface pair are added to the bridging table.
C. If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces.
D. If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface.Explanation
When an Ethernet bridge receives an incoming frame, it performs the following actions:
1. The source MAC address and input interface pair are added to the bridging table. This helps the bridge keep track of which devices are connected to which interfaces.
2. If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces. This means that the frame is sent to all connected devices, allowing the correct recipient to receive it.
3. If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface. This means that the frame is sent directly to the device that matches the destination MAC address in the bridging table.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Oct 17, 2008Quiz Created by
MSalmons
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