
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
Configuring and Verifying Cut-Through Proxy Authentication
Copy tftp: flash:
TCP
Troubleshooting Application Layer Inspection
Managing the Cisco ASA Adaptive Security Appliance Using Cisco ASDM
/48 NLA next level polymerization
1. Standard Access Control List 1-99, 1300-1999
Debug ip rip
ASAP.
The address format is fixed:
Configuration using point-to-point subinterfaces
1.Port mode
Check to see CDP neighbor ( not including IP)
Lesson 1: Preparing the Cisco ASA Adaptive Security Appliance for Network Integration
Configuring and Verifying a Policy for Management Traffic
Network administrators manually define (how many random)
2
Tuning Basic OSI Layer 3 and Layer 4 Inspection
No shut
Destination filename? (The original IOS name, you can directly enter the car).
Although these two methods (in / out) can achieve efficiency, but from a performance point of view, there is still a difference, in fact, the best way is to choose method 1, just like the thief did not enter the vault, at least into In your living room (B), dirty the carpet in your living room (B will consume some extra unnecessary treatment)
Switchport mode trunk
100Mbps 19
Vlan database
Invoke this application only for disaster recovery.
Configuring and Verifying Global ACLs
IP&PREFIX: 192.168.26.3/255.255.255.224
Router discovery function: RS, RA packet
I
Define password
the time was often not enough. The strange guy next to him was half an
students, and he will lead the students to blindly believe and blindly
EIGRP uses a wildcard mask configuration example :
2.GRE P2P site
Segmentation: Packets that are passed from the transport layer's TCP to the Internet layer.
=========================================================== ===============
Action :
Configuring and Verifying a Policy for Management Traffic
(It took half a month for troubleshooting 1 (1-BT7) and 5 days for TS2)
Ip address 192.168.2.1 255.255.255.0 secondary
(3) CCIE is more expensive
than 4k, but fortunately I didn't find bible to cope with the
Tunnel mode ipv6ip/gre/ipv6ip auto/ipv6ip isatap/ipv6ip 6to4
interface fastehternet 0/1 enter into fa0 / 1 Interface
Lesson 3: Configuring Cisco ASA Adaptive Security Appliance Device Management Features
Return directly to privileged mode
=========================================================== ================
Q8: D version CP snooping, add a trust, and then remove the D version of the CP lease
Show ip interface serial 0
one o'clock this morning, I kicked the ball back to the lab. I will
With the subinterface set ip
7. What are the characteristics of L3 *** and L2 ***? Which model do you think is more promising?
Assigned for this sub-specific interfaces of PVC. ??? is a PVC number .
15s
Target :
was not over yet. In the last row, there was a student who was looking
Line vty 0 ?
Network Access Layer: A layer in the TCP/IP stack that provides an interface to the physical network.
Encapsulation PPP
Module 4: Cisco ASA Adaptive Security Appliance Policy Control
Source :
In the afternoon, the LAB configuration exam was quite smooth, and the examiner has been busy with it. It seems that there is no time to trouble us. . .
I haven't come and updated for a long time. The past personality is basically a classic case study every month. Why is this blog that has been closed for nearly six months? Let me review the efforts of this time.
ACL is the most important : The ACL condition list will have a condition of hiding " reject all " at the end .
Network
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: Sep 16,2026
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