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Which of the following is displayed by the show ip dhcp snooping databasecommand? (Select the best answer.)
- the DHCP snooping configuration for a switch
- dynamic entries in the binding table
- the status of the binding table
- detailed DHCP snooping statistics
Explanation:
The show ip dhcp snooping database command displays the status of the binding table. When Dynamic Host Configuration Protocol (DHCP) snooping is configured on a Cisco Catalyst switch, the switch tracks client Media Access Control (MAC) addresses and their associated DHCP client hardware addresses in the DHCP snooping binding database, which is also known as the binding table. If the switch receives DHCP packets that do not match entries in the binding table, the switch drops the packets. The binding table can be stored locally or it can be stored on a remote server. The show ip dhcp snooping databasecommand can be used to display the status of the DHCP snooping binding table agent and statistics regarding the status of the binding table, such as the Uniform Resource Locator (URL) where the binding table can be found and how many successful writes have been committed to the table. For example, the following sample output indicates that the binding table is stored in a file named bindingtable on the Trivial File Transfer Protocol (TFTP) server with an IP address of 1.2.3.4:
The show ip dhcp snooping command displays general information regarding the DHCP snooping configuration on a switch, such as the virtual LANs (VLANs) for which DHCP snooping is enabled and the trusted state of each interface. For example, the following sample output indicates that DHCP snooping is enabled for VLANs 101, 201, and 301:
The show ip dhcp snooping binding command displays the dynamic entries in the binding table. You must use the show ip source binding command to view both static and dynamic binding table entries. For example, the following sample output from the show ip dhcp snooping binding command indicates that two DHCP clients from VLAN 101 have entries in the binding table:
The show ip dhcp snooping statistics detail command displays detailed DHCP snooping statistics, which include the number of packets dropped for each denial category, such as binding mismatches or exceeded rate limits. For example, the following sample output from the show ip dhcp snooping statistics detail command indicates that 2,130 packets were processed by DHCP snooping and 41 packets were dropped because of binding mismatches:
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