VLAN features : Data link layer : Active/Active Failover Show running-config to view the currently active configuration. This configuration file is stored in RAM. Free fragment forwarding , detecting only the first 64 bytes of the frame , judging the integrity of the frame . Configuration key chain A Configuration key 1 =========================================================== =============== Static state N A T configuration =========================================================== =================== environment is a truly honed environment. Now to refuse the thief to come in from A, then you have to set up in your living room, there are 2 ways: 2. There may be no configured clock frequency Enter into slot 0 of the number is 1 Ethernet port Ipv6 address 3FFE: FFFF: 1:: 1/64 Define password B will also judge whether A is on a network segment with himself, and finds that A and himself are not in a network segment. After B's judgment, the network segment where A is located is 192.168.26.128.0/255.255.255.224.0, and B himself The network segment is 192.168.26.0/255.255.224.0, and the packet is given to the gateway. the first day of the training school, everyone should abandon all 2.0.0.0 ~When I saw the mail at around 5 pm, the result of the "closed" was passed. I didn't know what to say except the tears. I immediately called my wife: "Wife, I passed." It turns out that as long as you plan well and implement it unswervingly, it will move in the direction you expect, and then you will work harder. That will surely be "waterful." Troubleshooting Transparent Firewall Debug ip igrp transactions 1. Switch and bridge don't continually hone myself from the laboratory stage and exercise my the belief of ccie, it is even more impossible to have practical sleep during the day,ccie routing and switching written, and I sleep at night. Before accepting an exam, I received an error-added attack. I lost my body and lost my body. What went wrong? I 3. Port number : Provides the session layer to distinguish data without application . Identity service . Network Access Layer: A layer in the TCP/IP stack that provides an interface to the physical network. The connection mode of the switch: 1. Cascading - directly connected by fiber or twisted pair; 2. Redundant - can be backed up or load balanced; 3. Stacking - requires dedicated stacking lines and interfaces Troubleshooting Cut-Through Proxy Operations =========================================================== =============== Let us first think about one sentence: the boss is about to take it, and it is thick and thin.Watch more videos, read more, experiment more, and extract the essence from it; in addition, don't forget to go to the dross! There are more people who are training lecturers, and not all of them are correct.1. Selectively checked/read the following list, and selectively did the experiment in the book.
Exam Code: CFG: LAB1、LAB1+、LAB2、LAB2+、LAB3
TS: TS1(5 sets)、TS2(3 sets)
DIAG:DIAG 1~DIAG 8(8 sets)
Certification Provider: Cisco
Certification Exam Name:CCIE Routing and Switching Lab
Update Date: Oct 31,2026

Problem:Server 1 can not get ip address.
Materials:
SW3#show ip dhcp snooping
Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
none
DHCP snooping is operational on following VLANs:
none
Smartlog is configured on following VLANs:
none
Smartlog is operational on following VLANs:
none
DHCP snooping is configured on the following L3 Interfaces:
Insertion of option 82 is enabled
circuit-id default format: vlan-mod-port
remote-id: 0018.b9da.5300 (MAC)
Option 82 on untrusted port is not allowed
Verification of hwaddr field is enabled
Verification of giaddr field is enabled
DHCP snooping trust/rate is configured on the following Interfaces:
Interface Trusted Allow option Rate limit (pps)
-------------------- ------- ------------ ----------------
Q1:Which material is most helpful
Q2:which packets can help you find the cause

Customer just setup a IPv6 Network, with HSRPv6 on R1 & R2. After setting up, all hosts lose connection.
What would you recommend to your L1 Engineer as a Quick Fix?
CE1 key configuration
standby 1 priority 200
standby 1 preempt
ipv6 nd router-preference low
CE2 key configuration
standby 1 preempt
ipv6 nd router-preference high
I think it is a rouge device because I don't see any problems with the HSRPv6 config. PCs are configured with "ipv6 enable", "ipv6 autoconfig"
The R1 have a "ipv6 nd-preference high" and R2 have "low" if I'm not wrong.
How fast fix the problem?
¡ Shutdown the link between CE2 and PE2.
¡ Shutdown the link between CE1 and PE1.
¡ Configure CE1 with highest HSRPv6 Priority.
¡ Configure CE2 with highest HSRPv6 pirority.
¡ Configure CE2 with low HSRPv6 priority.
¡ Shutdown CE1 interface e0/0.
¡ Shutdown PE2 interface e0/0.
¡ Disable fast-switching on CE's LAN.
¡ Enable fast-switching on CE's LAN.
¡ Change HSRPv1 to HSRPv2 version
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