Cisco dumps Everyday Ten Ask

1. Question: The meaning of the dot 1 q tunnel interface's untag and tag

Answer: Untag refers to the use of the untag vlan tag and forwarded when you want to send a data frame. Tag means to keep the original vlan tag and forward it.

2. Question: Match ip loose in the case of DHCP relay in am rule has no effect on DHCP relay.

Answer: The AM rule must be written.

3. Question: What is the impact of not setting Up Pevlan?

Answer: If a single-layer label enters the switch and PEvlan is set, the vlan label may be abnormal when the data is forwarded, such as a vlan tag on multiple dozens of times.

4. Question: How should the mirror interface be configured in the case of port aggregation?

Answer: Configure the mirror port. If the physical interface is configured for the aggregation interface, then the mirror ingress needs to be called in the aggregation interface.

5. Q: How many source ports can i configure for the port mirror?

Answer: There is no limit to the number of source interfaces for port mirroring but the session session session for port mirroring is limited and the number of different switches is inconsistent.

6. Question: remote-vlan trim

Answer: When configuring a pair of multi-mirrorimages, you need to configure remote-vlan, then deploy the spanning tree network environment. It is recommended that the remote-vlan do trimming so that traffic does not flood to other devices.

7. Question: Can a mirror port be both a destination port and a source port?

Answer: Many-to-many mirrors cannot be bidirectional and the same interface cannot be both a source and an end.

8. Question: What other functions can i have to replicate traffic besides port mirroring?

Answer: ACL reset direction, replication group (currently supported only by shunt switch), ipfix, sflow, the closest to the port mirrorfunction is the ACL reset direction.

9. Question: Do mirror edgy data receive only one-way mail data?

Answer: (1) Whether the source port is both two-way traffic.

(2) Whether the port data stream is full (including source interface/MACback loop interface/destination interface)

(3) The mail reception and non-delivery protocol are POP3 reception and SMTP transmission respectively.

10. Question: What does the switch parameter do in the port mirror?

Answer: The keyword switch which means that the destination port can also be connected to the Internet. If no keywords, then the port will not be able to access the external network.

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