Wendell odom

TTL (Time To Live), 429
TTL Exceeded (Time-to-Live 
Exceeded), 429-431
tunneling, CAPWAP, 639-640
two-switch topology, 123-124
U
UDP (User Datagram Protocol), 20
unabbreviated addresses (IPv6), 530
undebug all command, 104
undefined VLAN, troubleshooting, 
201-202
unicast addresses, 50-52, 290, 322, 
540, 556-564
unidirectional communication, 613
unified architectures. 
See 
centralized 
architectures
unique local addresses, 542, 551-553
universal addresses, 51
unknown addresses (IPv6), 574
unknown unicast frames, 114
URI (Universal Resource Identifiers), 
20
URL (Uniform Resource Locators), 20
USB ports, 89
User Datagram Protocol (UDP), 20
user EXEC mode, 91-93
user mode
external authentication servers, 
135-136
passwords, 130-135
usernames, 133-135, 147
users, segregating into logical 
networks, 676
UTP (Unshielded Twisted-Pair) cables, 
37
cabling pinouts, 42-49
overview, 39-40
UTP Ethernet links, 40-41
uWGB (Universal Workgroup Bridges), 
621
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794 verifying
V
verifying
Data VLAN, 198-199
EtherChannel configuration before 
adding interfaces, 251-253
Ethernet switching, 116
IPv4 on switch, 143-144
Layer 3 (multilayer) switch SVI, 
403-404
OSPF
configuration, 479-480
operation, 475-478
OSPFv2 interface configuration, 
485-486
ROAS, 398-400
static unicast address configuration, 
558-560
Voice VLAN, 198-199