Ch. 7: Configuring and Verifying Switch Interfaces

Question 1

port

Answer 1

In TCP and UDP, a number that is used to uniquely identify the application process that either sent (source port) or should receive (destination port) data. In LAN switching, another term for switch interface.

Question 2

autonegotiation

Answer 2

An IEEE standard mechanism (802.3u) with which two nodes can exchange messages for the purpose of choosing to use the same Ethernet standards on both ends of the link, ensuring that the link functions and functions well.

Question 3

full duplex

Answer 3

Generically, any communication in which two communicating devices can concurrently send and receive data. In Ethernet LANs, the allowance for both devices to send and receive at the same time, allowed when both devices disable their CSMA/CD logic.

Question 4

half duplex

Answer 4

Generically, any communication in which only one device at a time can send data. In Ethernet LANs, the normal result of the CSMA/CD algorithm that enforces the rule that only one device should send at any point in time.

Question 5

10/100

Answer 5

A short reference to an Ethernet NIC or switch port that supports speed of 10 Mbps and 100 Mbps.

Question 6

10/100/1000

Answer 6

A short reference to an Ethernet NIC or switch port that supports speeds of 10 Mbps, 100 Mbps, and 1000 Mbps (that is, 1 Gbps).

Question 7

interface (type port-number)

Answer 7

Changes context to interface mode. The type is typically Fast Ethernet or Gigabit Ethernet. The possible port numbers vary depending on the model of switch—for example, Fa0/1, Fa0/2, and so on.

Question 8

interface range (type port-number - end-port-number)

Answer 8

Changes the context to interface mode for a range of consecutively numbered interfaces. The subcommands that follow then apply to all interfaces in the range.

Question 9

shutdown | no shutdown

Answer 9

Interface mode. Disables or enables the interface, respectively.

Question 10

speed {10 | 100 | 1000 | auto}

Answer 10

Interface mode. Manually sets the speed to the listed speed or, with the auto setting, automatically negotiates the speed.

Question 11

duplex {auto | full | half}

Answer 11

Interface mode. Manually sets the duplex to half or full, or to autonegotiate the duplex setting.

Question 12

description (text)

Answer 12

Interface mode. Lists any information text that the engineer wants to track for the interface, such as the expected device on the other end of the cable.

Question 13

no duplex

no speed

no description

Answer 13

Reverts to the default setting for each interface subcommand of speed auto, duplex auto, and the absence of a description command.

Question 14

show running-config

Answer 14

Lists the currently used configuration

Question 15

show running-config | interface (type number)

Answer 15

Displays the running-configuration excerpt of the listed interface and its subcommands only

Question 16

show mac address-table dynamic [interface type number] [vlan vlan-id]

Answer 16

Lists the dynamically learned entries in the switch’s address (forwarding) table, with subsets by interface and/or VLAN

Question 17

show mac address-table static [interface type number]

Answer 17

Lists static MAC addresses and MAC addresses learned or defined with port security

Question 18

show interfaces [type number] status

Answer 18

Lists one output line per interface (or for only the listed interface if included), noting the description, operating state, and settings for duplex and speed on each interface

Question 19

show interfaces [type number]

Answer 19

Lists detailed status and statistical information about all interfaces (or the listed interface only)

Question 20

show interfaces description

Answer 20

Displays one line of information per interface, with a two-item status (similar to the show interfaces command status), and includes any description that is configured on the interfaces