Troubleshoot IPv6 Network Connectivity

11Step 1:

PC1>ping SRV1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 2001:DB8:0:4::30, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

Troubleshoot IPv4 Network Connectivity

9
PC1#telnet 10.10.3.30
Trying 10.10.3.30 ...
% Destination unreachable; gateway or host down

PC1#ping 10.10.3.30
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.3.30, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)

Configure and Verify IPv4 Extended Access Lists

8
R1(config)#ip access-list extended Example4
R1(config-ext-nacl)#deny udp ?
  A.B.C.D       Source address
  any           Any source host
  host          A single source host
  object-group  Source network object group

R1(config-ext-nacl)#deny udp any ?
  A.B.C.D       Destination address
  any           Any destination host
  eq            Match only packets on a given port number
  gt            Match only packets with a greater port number
  host          A single destination host
  lt            Match only packets with a lower port number
  neq           Match only packets not on a given port number
  object-group  Destination network object group
  range         Match only packets in the range of port numbers

Troubleshoot HSRP

6
R1：

interface Ethernet0/0
 ip address 10.10.1.2 255.255.255.0
 standby 1 ip 10.10.1.1
!
interface Ethernet0/1
 ip address 10.1.1.2 255.255.255.252

Configure Root Bridge and Analyze STP Topology

2p64.  Step 1~ step 8
SW1#sh spanning-tree vlan 20
VLAN0020
  Spanning tree enabled protocol ieee
  Root ID    Priority    32788
             Address     aabb.cc00.0100
             This bridge is the root (因為 SW1 MAC Addr 最小)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    32788  (priority 32768 sys-id-ext 20)
             Address     aabb.cc00.0100
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  300 sec
Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Et0/1               Desg FWD 100       128.2    Shr
Et0/2               Desg FWD 100       128.3    Shr

Troubleshoot VLANs and Trunks

1.