Term
What is the management interface on a switch that uses CatOS?
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Definition
The Cisco CatOS-based Catalyst family of switches use a management interface or sc0 for the switch management.
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Term
What is the limitation in configurating DHCP on a CatOS switch?
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Definition
IP configuration through DHCP is possible only for the sc0 management interface.
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Term
What command is used to configure a switch to use DHCP for managing IP configuration using CatOS?
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Definition
| set interface sc0 0.0.0.0 |
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Term
What command renews the management IP on a switch using DHCP?
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Definition
set interface sc0 dhcp renew
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Term
What command releases the management IP of a switch using CatOS and DHCP?
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Definition
set interface sc0 dhcp release
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Term
Under what 2 conditions do a DHCP-based IP configuration not occur?
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Definition
- When the switch has a configuration file and the service config global configuration command is disabled - When the switch has a configuration file present in NVRAM and the service config global configuration command is disabled.
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Term
What command enables the debounce timer feature on and interface using IOS? CatOS?
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Definition
IOS: link-debounce CatOS: set port debounce interface enable
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Term
What command changes the default timer on an interface using debounce with IOS? With CatOS?
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Definition
IOS:link-debounce time debounce-time CatOS:set port debounce mod/port delay millisec
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Term
What command enables broadcast suppression on a port using CatOS?
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Definition
| set port broadcast mod/port threshold% [violation {drop packets | err-disable}] [multicast {enable | disable}] [unicast {enable | disable}] |
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Term
What interface command enables storm control on a switch using IOS?
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Definition
| storm-control {broadcast | multicast | unicast} level level |
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Term
What are baby giant frames?
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Definition
Baby giant frames are slightly larger than standard ethernet frames and are designed to accommodate various encapsulations with an MTU of up to 1600 bytes. |
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Term
How big can a jumbo Ethernet frame be? |
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Definition
A jumbo Ethernet frame is an Ethernet frame whose size is as large as 9236 bytes
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Term
What happens when a switch forwards a frame from an interface that supports jumbo frames to an interface that doesn't?
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Definition
The receiving switch will drop the receiving frame if it does not support the bigger size.
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Term
What command enables jumbo frame support using CatOS?
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Definition
| set port jumbo mod/port enable |
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Term
What global command configures a baby giant on a IOS-enabled switch?
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Definition
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Term
What command enables jumbo frames on an interface using IOS?
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Definition
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Term
What is the benefit of using the error-disable feature on a Catalyst switch?
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Definition
The error-disable feature allows the switch to detect certain error conditions on interfaces and disable them before the error condition affects the entire switch or the rest of the network.
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Term
What are the 2 ways to recover an interface that has transitioned into the err-disable state?
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Definition
- Manual recovery - Issue the shutdown, then no shutdown command ( or set port [disable | enable] mod/port - Automatic recovery - The switch can be configured to automatically recover the error-disabled interface after a specific interval. |
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Term
What IOS command enables detection for the error-disable feature on a switch?
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Definition
errdisable detect cause {all | arp-inspection | dhcp-rate-limit | dtp-flap | gbic-invalid | 12ptguard | link-flap | page-flap}
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Term
What IOS command enables automatic recovery from error-disabled conditions?
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Definition
| errdisable recovery cause {all | ...specific causes} |
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Term
What CatOS command enables automatic recovery from error-disabled on a switch?
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Definition
set errdisable-timeout {enable | disable} {bpdu-guard | channel-misconfig | duplex-mismatch | udld | other | all}
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Term
What IOS command specifies the interval for attempting to recover from error-disabled state? For CatOS?
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Definition
IOS: errdisable recovery interval interval CatOS: set errdisable-timeout interval seconds
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Term
Describe how IEEE 802.3 flow control works.
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Definition
IEEE 802.3 flow control uses specific frames called pause frames used to instruct its link partner to delay sending frames for a specific time. A recieving interface needs to be configured to send pause frames when needed, and the sending interface needs to be configured to acknowledge them.
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Term
What IOS command configures flow control on a switch interface?
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Definition
[no] flowcontrol [receive | send] {on | off | desired}
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Term
Describe the function of the UDLD protocol.
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Definition
The UDLD protocol is a L2 protocol that allows for the detection of unidirectional link conditions on switch ports in situations where a link remains in the up state but the interface is not passing traffic.
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Term
How does UDLD check that its links with its neighbors are functioning correctly?
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Definition
The switch periodically sends UDLD protocol packets to its neighbors and expects the packets to be echoed back before a predetermined timer expires. If the timer expires, the switch determines the link to be unidirectional and shuts down the port.
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Term
What is the default interval for UDLD messages?
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Definition
The default interval for UDLD messages is 15 seconds.
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Term
What IOS command enables aggressive UDLD on a switch interface?
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Definition
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Term
What CatOS command enables UDLD on a switch interface or globally on all ports?
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Definition
| set udld enable [mod/port] |
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