TCP/IP : Fundamentals And Protocols! Trivia Quiz

The destination MAC address in the frame would be the MAC address of PC2 because PC1 is communicating directly with PC2 on the same segment of a switch. The destination MAC address in the frame specifies the intended recipient of the frame, in this case, PC2.

When PC1 pings PC2, the hub will broadcast the ping message to all devices connected to it, including the switch. The switch will then learn the MAC addresses of both PC1 and PC2 because it sees the communication from both devices. Therefore, the switch port will have two MAC addresses learned.

When a switch receives a frame with an unknown destination MAC address, it floods the frame to all ports except the one it was received on. Since the switch has 24 ports, the frame will be flooded to 23 ports, excluding the port it was received on. Therefore, the correct answer is 23.

The correct answer is half duplex only. This is because a hub is a shared medium where data is sent to all connected devices. In half duplex mode, only one device can transmit data at a time, while the others must wait. Since the other ports of the hub are free and not connected to any other devices, there is no need for full duplex operation where simultaneous bi-directional communication is possible.

In an 802.1q encapsulated ethernet frame, the field that contains the value of the upper layer protocol is the Type field in the ethernet frame. The Type field specifies the protocol being used in the data payload of the ethernet frame, allowing the receiving device to correctly interpret and process the data.

When a PC on sw1 generates a broadcast frame, it is sent out to all ports on sw1, including ports 5 and 6. Since sw2 is connected to sw1 through these ports, the broadcast frame will be received by sw2 on its corresponding ports 5 and 6. However, sw1 will not receive a copy of the broadcast frame on its own ports 5 and 6 because it originated from sw1 itself. Therefore, the correct answer is 2 copies of the frame would be received back by sw1 on ports 5 and 6.

When the PC is disconnected from the hub, the switch will not modify the mac-address table for port 1. The mac-address of the PC will still be retained in the table, even though the PC is no longer connected. This is because the switch will not actively remove entries from the mac-address table unless it receives a signal that the device has been disconnected. Therefore, the statement is true.

When a switch port is operating in full-duplex mode and is connected to a PC operating in half-duplex mode, the effective duplex settings for communication would be half duplex. This is because the communication will be limited to the capabilities of the device with the lower duplex setting, in this case, the PC. The switch will adjust its settings to match the PC's half-duplex mode, allowing for successful communication.

The most significant bit of the first octet (00) will be sent last for the mac-address 00-1b-78-ab-9f-99. In the Canonical format, the most significant bit is sent first, followed by the least significant bits. Therefore, in this case, the most significant bit of the first octet (00) will be sent last.

LLC (Logical Link Control) - Type 2 should be implemented in the design if reliability is required at Layer 2. LLC - Type 2 provides error control and flow control mechanisms to ensure reliable data transmission between two nodes in a network. It handles error detection, retransmission of lost or corrupted frames, and manages the flow of data to prevent congestion. Therefore, implementing LLC - Type 2 at Layer 2 would ensure the required reliability in the network.

If the source and destination MAC addresses in an Ethernet frame received on a switch port are the same, it means that the frame is a looped frame. In order to prevent network loops, switches have a mechanism called Spanning Tree Protocol (STP) that detects and disables redundant paths in the network. When a looped frame is detected, the switch will discard the frame to prevent the creation of a network loop. Therefore, the correct answer is that the frame will be filtered and discarded.

A layer 2 switch typically checks the destination MAC address in an Ethernet frame to determine where to forward the frame. However, it does not usually check the data field of the frame unless it is destined for itself. The data field contains the actual payload of the frame, such as the information being transmitted. Since the switch is primarily concerned with forwarding the frame based on the destination MAC address, it does not need to inspect the data field unless it needs to process the frame locally.

Cut through switching is a form of switching where the switch starts forwarding the frame as soon as it receives the destination address, without waiting for the entire frame to be received. In this case, the CRC value of the frame is calculated only by the destination. This means that the switch does not perform any CRC check on the frame before forwarding it. Therefore, the correct answer is Cut through.

All of the devices mentioned in the options (access points, switches, routers) have a MAC address. A MAC address is a unique identifier assigned to network interfaces for communication on a network. Therefore, the correct answer is "None of the above" as all the mentioned devices have a MAC address.

In an Ethernet frame communicating in a TCP/IP environment with HTTP traffic, the value of TYPE would be IP. This is because IP (Internet Protocol) is responsible for routing and addressing packets of data across the internet. TCP (Transmission Control Protocol) is a protocol that operates on top of IP and ensures reliable delivery of data. HTTP (Hypertext Transfer Protocol) is an application layer protocol that uses TCP/IP to transmit web page data. Therefore, the TYPE value in this scenario would be IP, as it represents the underlying protocol used for communication.

LLC Type 3 offers a connectionless acknowledged service. Connectionless means that there is no established connection between the sender and receiver before data transmission. Acknowledged service means that the receiver acknowledges the successful receipt of data, ensuring reliable delivery. Therefore, LLC Type 3 provides a reliable and acknowledged data transmission service without the need for a pre-established connection.

After 5 minutes, the mac-address-table on the switch will still display only the mac-address of PC2. This is because the mac-age time configured on the port is 5 minutes, which means that any mac-address that has not been refreshed within 5 minutes will be removed from the table. Since no traffic has been triggered, the mac-address of PC2 will remain in the table as it was added just before 2 minutes and has not yet reached the 5-minute mark. The mac-addresses of PC1 and the hub port will not be displayed in the table.

When a PC is disconnected from a switch port and connected to another port, the switch will update its mac-address table. The mac-address of the PC that was learned on port 1 will be removed from the mac-address table. This is because the switch keeps track of the mac-addresses associated with each port, and when a device is disconnected, it removes that mac-address from the table.