Switch Port Configuration
1.Put the following Ethernet standards in order of increasing bandwidth:
802.3z
802.3ae
802.3
802.3u
Answer: c, d, a, b
2.What benefits does switched Ethernet have over shared Ethernet?
Answer: Switched Ethernet ports receive dedicated bandwidth, have a reduced collision domain, and show increased performance because of segmentation or fewer users per port.
3.When a 10/100 Ethernet link is autonegotiating, which will be chosen if both stations can support the same capabilities10BASE-T full duplex, 100BASE-TX half duplex, or 100BASE-TX full duplex?
Answer: 100BASE-TX full duplex will be chosen because it has the highest autonegotiation priority and is common to both end stations.
4.How many pairs of copper wires does a 1000BASE-T connection need?
Answer:Four pairs
5.A switch port is being configured as shown here. What command is needed next to set the port to full-duplex mode?
Switch(config)# interface fastethernet 0/13
Switch(config-if)#
Answer: Enter the command duplex full at the prompt.
6.If a full-duplex Gigabit Ethernet connection offers 2 Gbps throughput, can a single host send data at 2 Gbps?
Answer: No, a full-duplex Gigabit Ethernet connection allows only 1 Gbps simultaneously in each direction across the link.
7.Which GBIC would you use for a connection over multimode fiber (MMF)?
Answer:You could use either a 1000BASE-SX or a 1000BASE-LX/LH.
8. A Category 5 cable having only pins 1,2 and 3,6 has been installed and used for a Fast Ethernet link. Can this same cable be used for a migration to Gigabit Ethernet using 1000BASE-T GBICs, assuming that the length is less than 100 m?
Answer: No. 1000BASE-T requires all four pairs of wires to be present.
9. A Catalyst 3560 switch port has been configured for 100 Mbps full-duplex mode, but a link cannot be established. What are some commands that you could use to investigate and correct the problem?
Answer: To see the current state of one or more ports, you could use the show interface command. This would show the ports' speed and duplex modes, and whether a link has been established. One reason the link is not established could be that the port is shut down or disabled. To enable the port, use the no shutdown interface-configuration command. Because the port has been set to 100 Mbps full-duplex mode, it is possible that the end station can support only 10 Mbps at half duplex. Therefore, set the port for autonegotiate mode with the speed auto and duplex auto commands. Otherwise, you could set the port to a fixed speed and mode that would match that of the end station.
802.3z
802.3ae
802.3
802.3u
Answer: c, d, a, b
2.What benefits does switched Ethernet have over shared Ethernet?
Answer: Switched Ethernet ports receive dedicated bandwidth, have a reduced collision domain, and show increased performance because of segmentation or fewer users per port.
3.When a 10/100 Ethernet link is autonegotiating, which will be chosen if both stations can support the same capabilities10BASE-T full duplex, 100BASE-TX half duplex, or 100BASE-TX full duplex?
Answer: 100BASE-TX full duplex will be chosen because it has the highest autonegotiation priority and is common to both end stations.
4.How many pairs of copper wires does a 1000BASE-T connection need?
Answer:Four pairs
5.A switch port is being configured as shown here. What command is needed next to set the port to full-duplex mode?
Switch(config)# interface fastethernet 0/13
Switch(config-if)#
Answer: Enter the command duplex full at the prompt.
6.If a full-duplex Gigabit Ethernet connection offers 2 Gbps throughput, can a single host send data at 2 Gbps?
Answer: No, a full-duplex Gigabit Ethernet connection allows only 1 Gbps simultaneously in each direction across the link.
7.Which GBIC would you use for a connection over multimode fiber (MMF)?
Answer:You could use either a 1000BASE-SX or a 1000BASE-LX/LH.
8. A Category 5 cable having only pins 1,2 and 3,6 has been installed and used for a Fast Ethernet link. Can this same cable be used for a migration to Gigabit Ethernet using 1000BASE-T GBICs, assuming that the length is less than 100 m?
Answer: No. 1000BASE-T requires all four pairs of wires to be present.
9. A Catalyst 3560 switch port has been configured for 100 Mbps full-duplex mode, but a link cannot be established. What are some commands that you could use to investigate and correct the problem?
Answer: To see the current state of one or more ports, you could use the show interface command. This would show the ports' speed and duplex modes, and whether a link has been established. One reason the link is not established could be that the port is shut down or disabled. To enable the port, use the no shutdown interface-configuration command. Because the port has been set to 100 Mbps full-duplex mode, it is possible that the end station can support only 10 Mbps at half duplex. Therefore, set the port for autonegotiate mode with the speed auto and duplex auto commands. Otherwise, you could set the port to a fixed speed and mode that would match that of the end station.
posted by Arivu at
12:56 pm
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