Exam Preparation Tasks
Review All Key Topics
Review the most important topics in the chapter, noted with the Key Topic icon in the outer margin of the page. Table 3-8 lists a reference of these key topics and the page numbers on which each is found.
Table 3-8 Key Topics for Chapter 3
|
Key Topic Element |
Description |
Page Number |
Paragraph |
Describes the characteristics of Ethernet switching |
59 |
Paragraph |
Discusses Ethernet scaling |
61 |
Paragraph |
Covers 10-Gigabit Ethernet |
62 |
Paragraph |
Explains Ethernet autonegotiation |
64 |
Paragraph |
Covers interface selection for configuration |
66 |
Paragraph |
Explains how to configure the port speed |
68 |
Paragraph |
Explains how to configure the port duplex mode |
69 |
Paragraph |
Explains how to configure port error detection |
69 |
Paragraph |
Explains how to verify the port state |
71 |
Paragraph |
Explains how to verify port speed and duplex mode |
72 |
Paragraph |
Covers CDP neighbor discovery |
73 |
Paragraph |
Covers LLDP neighbor discovery |
75 |
Paragraph |
Describes Power over Ethernet for Cisco IP phones |
77 |
Table 3-7 |
Lists IEEE 802.3af PoE device classes |
79 |
Complete Tables and Lists from Memory
There are no memory tables in this chapter.
Define Key Terms
Define the following key terms from this chapter, and check your answers in the glossary:
- CSMA/CD
- duplex mode
- autonegotiation
- duplex mismatch
- IEEE 802.3
- CDP
- LLDP
- TLV
- Power over Ethernet (PoE)
- power class
Use Command Reference to Check Your Memory
This section includes the most important configuration and EXEC commands covered in this chapter. It might not be necessary to memorize the complete syntax of every command, but you should remember the basic keywords that are needed.
To test your memory of the port configuration commands, cover the right side of Tables 3-9 through 3-11 with a piece of paper, read the description on the left side, and then see how much of the command you can remember.
Table 3-9 Switch Port Configuration Commands
Task |
Command Syntax |
Select a port. |
Switch(config)# interface type member/module/number |
Select multiple ports. |
Switch(config)# interface range type member/module/number [, type member/module/number ...] or Switch(config)# interface range type member/module/first-number - last-number |
Define an interface macro. |
Switch(config)# define interface-range macro-name type member/module/number [, type member/module/number ...] [ type member/module/first-number - lastnumber ] [...] Switch(config)# interface range macro macro-name |
Identify port. |
Switch(config-if)# description description-string |
Set port speed. |
Switch(config-if)# speed {10 | 100 | 1000 | auto} |
Set port mode. |
Switch(config-if)# duplex {auto | full | half} |
Detect port error conditions. |
Switch(config-if)# errdisable detect cause [all | cause name] |
Automatically recover from errdisable. |
Switch(config-if)# errdisable recovery cause [ all | cause name ] Switch(config-if)# errdisable recovery interval seconds |
Manually recover from errdisable. |
Switch(config-if)# shutdown Switch(config-if)# no shutdown |
Display ports in errdisable state |
Switch(config)# show interface status err-disabled |
Table 3-10 Neighbor Discovery Commands
Task |
Command Syntax |
Display CDP neighbor information. |
Switch# show cdp neighbors [ type member/module/number ] [ detail ] |
Control CDP operation globally. |
Switch(config)# [no] cdp run |
Control CDP operation on an interface. |
Switch(config-if)# [ no ] cdp enable |
Display LLDP neighbor information. |
Switch(config)# show lldp neighbors [ type member/module/number ] [ detail ] |
Control LLDP operation globally. |
Switch(config)# [ no ] lldp run |
Control LLDP operation on an interface. |
Switch(config-if)# [ no ] lldp { receive | transmit } |
Table 3-11 Power over Ethernet Commands
Task |
Command Syntax |
Set PoE behavior. |
Switch(config-if)# power inline { auto | static } [ max milliwatts ] |
Disable PoE on a switch port |
Switch(config-if)# power inline never |
Display PoE status. |
Switch# show power inline [ type member/mod/num ] [ detail ] |
Remember that the CCNP exam focuses on practical or hands-on skills that are used by a networking professional. Therefore, you should remember the commands needed to configure and test a switch interface.