While working in the core network building, a technician accidently bumps the fiber connection between two core switches and damages one of the pairs of fiber. As
designed, the link was placed into a non-forwarding state due to a fault with UDLD. After the damaged cable was replaced, the link did not recover. What solution
allows the network switch to automatically recover from such an issue?
A.
macros
B.
errdisable autorecovery
C.
IP Event Dampening
D.
command aliases
E.
Bidirectional Forwarding Detection
Explanation:
There are a number of events which can disable a link on a Catalyst switch, such as the detection of a loopback, UDLD failure, or a broadcast storm. By default,
manual intervention by an administrator is necessary to restore the interface to working order; this can be done by issuing shutdown followed by no shutdown on the
interface. The idea behind requiring administrative action is so that a human engineer can intercede, assess, and (ideally) correct the issue. However, some
configurations may be prone to accidental violations, and a steady recurrence of these can amount to a huge time sink for the administrative staff. This is where
errdisable autorecovery can be of great assistance. We can configure the switch toautomatically re-enable any error-disabled interfaces after a specified timeout period. This gives the offending issue a chance to be cleared by the user (for
example, by removing an unapproved device) without the need for administrative intervention.
http://packetlife.net/blog/2009/sep/14/errdisable-autorecovery/
New 300-115 Exam Questions and Answers Updated Recently (4/July/2017):
NEW QUESTION 390
Which feature do you implement so that an interface enters the root inconsistent state if it receives a superior BPDU?
A. DPDU filter
B. root guard
C. BPDU guard
D. loop guard
Answer: B
NEW QUESTION 391
In which two ways can a port respond to a port-security violation? (Choose two.)
A. The port enters the en-disabled state.
F. The port enters the shutdown state.
NEW QUESTION 392
Which three functions does Dynamic ARP Inspection perform with invalid IP-to MAC address bindings? (Choose three.)
A. accepts
B. deletes
C. discards
D. bypasses
E. intercepts
F. logs
Answer: CEF
NEW QUESTION 393
Which two statements about 802.1Q are true? (Choose two.)
A. It encapsulates the original Ethernet frame and adds a VLAN identifier.
B. It increases the maximum size an Ethernet frame to 1094 bytes.
C. It is a Cisco proprietary protocol.
D. When It is enabled, it forces a recalculation of the frame check sequence field.
E. It supports 8-byte VLAN identifiers.
F. It adds a 32-bit field to the Ethernet frame between the source MAC address and length fields.
Answer: DF
NEW QUESTION 394
A physical switch port is part of an EtherChannel group. What happenes while the same port configured as a SPAN destination?
A. The port forwards traffic in the EtherChannel group and acts as a SPAN source simultaneously.
B. The port is removed from the EtherChannel group.
C. The port is put in the errdisabled state and can only be reenabled manually.
D. The operation is not allowed as an EtherChannel member cannot be a SPAN source port.
Answer: D
NEW QUESTION 395
Which two statements about CDP are true? (Choose two.)
A. CDP uses a TLV to advertise the native VLAN
B. CDP is not supported with SNMP
C. CDP is supported on Frame Relay sub interfaces.
D. CDP runs on OSI layer 2
E. CDP runs on OSI layer 1
Answer: AC
NEW QUESTION 396
Which two combinations of Ether Channel modes support the formation of an EtherChannel? (Choose two.)
A. desirable, passive
B. desirable, desirable
C. active, passive
D. passive, passive
E. active, desirable
Answer: BC
NEW QUESTION 397
……
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