Last Updated on December 1, 2018 by Admin
Introduction to Networks (version 6.00) – ITN Chapter 5 Exam Beta Online 2018 100%
ITN -- Chapter 5 Exam Beta
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ITN -- Chapter 5 Exam Beta
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Question 1 of 19
1. Question
1 pointsWhat is the primary purpose of ARP?Correct
Incorrect
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Question 2 of 19
2. Question
1 pointsWhat addressing information is recorded by a switch to build its MAC address table?Correct
Incorrect
A switch builds a MAC address table by inspecting incoming Layer 2 frames and recording the source MAC address found in the frame header. The discovered and recorded MAC address is then associated with the port used to receive the frame.Hint
A switch builds a MAC address table by inspecting incoming Layer 2 frames and recording the source MAC address found in the frame header. The discovered and recorded MAC address is then associated with the port used to receive the frame. -
Question 3 of 19
3. Question
1 pointsWhat statement describes the function of the Address Resolution Protocol?Correct
Incorrect
When a PC wants to send data on the network, it always knows the IP address of the destination. However, it also needs to discover the MAC address of the destination. ARP is the protocol that is used to discover the MAC address of a host that belongs to the same network.Hint
When a PC wants to send data on the network, it always knows the IP address of the destination. However, it also needs to discover the MAC address of the destination. ARP is the protocol that is used to discover the MAC address of a host that belongs to the same network. -
Question 4 of 19
4. Question
1 pointsRefer to the exhibit. PC1 issues an ARP request because it needs to send a packet to PC2. In this scenario, what will happen next?Correct
Incorrect
When a network device wants to communicate with another device on the same network, it sends a broadcast ARP request. In this case, the request will contain the IP address of PC2. The destination device (PC2) sends an ARP reply with its MAC address.Hint
When a network device wants to communicate with another device on the same network, it sends a broadcast ARP request. In this case, the request will contain the IP address of PC2. The destination device (PC2) sends an ARP reply with its MAC address. -
Question 5 of 19
5. Question
2 pointsWhat are two potential network problems that can result from ARP operation? (Choose two.)Correct
Incorrect
Large numbers of ARP broadcast messages could cause momentary data communications delays. Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent to intercept network traffic. ARP requests and replies cause entries to be made into the ARP table, not the MAC address table. ARP table overflows are very unlikely. Manually configuring static ARP associations is a way to prevent, not facilitate, ARP poisoning and MAC address spoofing. Multiple ARP replies resulting in the switch MAC address table containing entries that match the MAC addresses of connected nodes and are associated with the relevant switch port are required for normal switch frame forwarding operations. It is not an ARP caused network problem.Hint
Large numbers of ARP broadcast messages could cause momentary data communications delays. Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent to intercept network traffic. ARP requests and replies cause entries to be made into the ARP table, not the MAC address table. ARP table overflows are very unlikely. Manually configuring static ARP associations is a way to prevent, not facilitate, ARP poisoning and MAC address spoofing. Multiple ARP replies resulting in the switch MAC address table containing entries that match the MAC addresses of connected nodes and are associated with the relevant switch port are required for normal switch frame forwarding operations. It is not an ARP caused network problem. -
Question 6 of 19
6. Question
1 pointsA 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?Correct
Incorrect
With shared memory buffering, the number of frames stored in the buffer is restricted only by the 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.Hint
With shared memory buffering, the number of frames stored in the buffer is restricted only by the 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. -
Question 7 of 19
7. Question
1 pointsWhich statement describes the treatment of ARP requests on the local link?Correct
Incorrect
One of the negative issues with ARP requests is that they are sent as a broadcast. This means all devices on the local link must receive and process the request.Hint
One of the negative issues with ARP requests is that they are sent as a broadcast. This means all devices on the local link must receive and process the request. -
Question 8 of 19
8. Question
1 pointsWhat happens to runt frames received by a Cisco Ethernet switch?Correct
Incorrect
In an attempt to conserve bandwidth and not forward useless frames, Ethernet devices drop frames that are considered to be runt (less than 64 bytes) or jumbo (greater than 1500 bytes) frames.Hint
In an attempt to conserve bandwidth and not forward useless frames, Ethernet devices drop frames that are considered to be runt (less than 64 bytes) or jumbo (greater than 1500 bytes) frames. -
Question 9 of 19
9. Question
2 pointsWhat are the two sizes (minimum and maximum) of an Ethernet frame? (Choose two.)Correct
Incorrect
The minimum Ethernet frame is 64 bytes. The maximum Ethernet frame is 1518 bytes. A network technician must know the minimum and maximum frame size in order to recognize runt and jumbo frames.Hint
The minimum Ethernet frame is 64 bytes. The maximum Ethernet frame is 1518 bytes. A network technician must know the minimum and maximum frame size in order to recognize runt and jumbo frames. -
Question 10 of 19
10. Question
1 pointsWhat statement describes Ethernet?Correct
Incorrect
Ethernet is the most common LAN protocol in the world. It operates at Layer 1 and 2, but is not required for Internet communication. The OSI model is used to describe how networks operate. A WAN connects multiple sites located in different countries.Hint
Ethernet is the most common LAN protocol in the world. It operates at Layer 1 and 2, but is not required for Internet communication. The OSI model is used to describe how networks operate. A WAN connects multiple sites located in different countries. -
Question 11 of 19
11. Question
1 pointsWhat is auto-MDIX?Correct
Incorrect
Auto-MDIX is a feature that is enabled on the latest Cisco switches and that allows the switch to detect and use whatever type of cable is attached to a specific port.Hint
Auto-MDIX is a feature that is enabled on the latest Cisco switches and that allows the switch to detect and use whatever type of cable is attached to a specific port. -
Question 12 of 19
12. Question
1 pointsWhich switching method uses the CRC value in a frame?Correct
Incorrect
When the store-and-forward switching method is used, the switch receives the complete frame before forwarding it on to the destination. The cyclic redundancy check (CRC) part of the trailer is used to determine if the frame has been modified during transit. In contrast, a cut-through switch forwards the frame once the destination Layer 2 address is read. Two types of cut-through switching methods are fast-forward and fragment-free.Hint
When the store-and-forward switching method is used, the switch receives the complete frame before forwarding it on to the destination. The cyclic redundancy check (CRC) part of the trailer is used to determine if the frame has been modified during transit. In contrast, a cut-through switch forwards the frame once the destination Layer 2 address is read. Two types of cut-through switching methods are fast-forward and fragment-free. -
Question 13 of 19
13. Question
1 pointsRefer to the exhibit. The switches are in their default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?Correct
Incorrect
Since host A does not have the MAC address of the default gateway in its ARP table, host A sends an ARP broadcast. The ARP broadcast would be sent to every device on the local network. Hosts B, C, and router R1 would receive the broadcast. Router R1 would not forward the message.Hint
Since host A does not have the MAC address of the default gateway in its ARP table, host A sends an ARP broadcast. The ARP broadcast would be sent to every device on the local network. Hosts B, C, and router R1 would receive the broadcast. Router R1 would not forward the message. -
Question 14 of 19
14. Question
2 pointsWhich two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)Correct
Incorrect
Logical link control is implemented in software and enables the data link layer to communicate with the upper layers of the protocol suite. Logical link control is specified in the IEEE 802.2 standard. IEEE 802.3 is a suite of standards that define the different Ethernet types. The MAC (Media Access Control) sublayer is responsible for the placement and retrieval of frames on and off the media. The MAC sublayer is also responsible for adding a header and a trailer to the network layer protocol data unit (PDU).Hint
Logical link control is implemented in software and enables the data link layer to communicate with the upper layers of the protocol suite. Logical link control is specified in the IEEE 802.2 standard. IEEE 802.3 is a suite of standards that define the different Ethernet types. The MAC (Media Access Control) sublayer is responsible for the placement and retrieval of frames on and off the media. The MAC sublayer is also responsible for adding a header and a trailer to the network layer protocol data unit (PDU). -
Question 15 of 19
15. Question
1 pointsRefer 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?Correct
Incorrect
The MAC address of PC3 is not present in the MAC table of the switch. Because the switch does not know where to send the frame that is addressed to PC3, it will forward the frame to all the switch ports, except for port 4, which is the incoming port.Hint
The MAC address of PC3 is not present in the MAC table of the switch. Because the switch does not know where to send the frame that is addressed to PC3, it will forward the frame to all the switch ports, except for port 4, which is the incoming port. -
Question 16 of 19
16. Question
1 pointsWhat is the purpose of a CAM table?Correct
Incorrect
The content addressable memory (CAM) table is another common name for the MAC address table. The CAM table holds learned MAC addresses and port numbers that are then used to forward data to specific network devices.Hint
The content addressable memory (CAM) table is another common name for the MAC address table. The CAM table holds learned MAC addresses and port numbers that are then used to forward data to specific network devices. -
Question 17 of 19
17. Question
2 pointsWhich two types of IPv6 messages are used in place of ARP for address resolution?Correct
Incorrect
IPv6 does not use ARP. Instead, ICMPv6 neighbor discovery is used by sending neighbor solicitation and neighbor advertisement messages.Hint
IPv6 does not use ARP. Instead, ICMPv6 neighbor discovery is used by sending neighbor solicitation and neighbor advertisement messages. -
Question 18 of 19
18. Question
1 pointsHow does a Cisco switch operate when a computer with a Gigabit Ethernet port connects to a Gigabit port on the switch?Correct
Incorrect
Most Cisco switches default to autonegotiation for speed and duplex, but Gigabit Ethernet ports only operate in full-duplex mode.Hint
Most Cisco switches default to autonegotiation for speed and duplex, but Gigabit Ethernet ports only operate in full-duplex mode. -
Question 19 of 19
19. Question
1 pointsHow does a switch react when the destination MAC address is the same as the source MAC address in the received Layer 2 frame?Correct
Incorrect
Whenever a PC might ping its own IP address, the source and destination MAC addresses would be the same along with the source and destination IP addresses. A switch does not send a frame back out the same port on which the frame came in. The switch drops the frame if the source and destination MAC addresses are the same.Hint
Whenever a PC might ping its own IP address, the source and destination MAC addresses would be the same along with the source and destination IP addresses. A switch does not send a frame back out the same port on which the frame came in. The switch drops the frame if the source and destination MAC addresses are the same.