ZyXEL Communications NXC5200 User Manual page 716

Index
T
T/TCP
355
target market
25
TCP
413
ACK (acknowledgment)
ACK number
327
attack packet
313, 348
connections
413
decoder
345, 353
decoy portscan
distributed portscan
flag bits
327
port numbers
414
portscan
349
portsweep
350
RST
350
SYN (synchronize)
SYN flood
352
window size
327
Telnet
496
and address groups
and address objects
and zones
497
with SSH
494
Temporal Key Integrity Protocol (TKIP)
three-way handshake
time
464
time servers (default)
time to live
320
timestamp
321
token
426
traffic anomaly
338, 342
traffic statistics
121
Transmission Control Protocol, see TCP
Transport Layer Security (TLS)
trapdoor attacks
315
trial subscription services
triangle routes
256
allowing through the firewall
vs virtual interfaces
trojan attacks
315
troubleshooting
531, 543
truncated-address-header attack
truncated-header attack
truncated-options attack
716
352
349
350
352
497
497
643
352
467
498
154
258
256
355
355, 356
355
truncated-timestamp-header attack
Trusted Certificates, see also certificates
TTCP-detected attack
355
U
UDP
413
attack packet
313, 348
decoder
345, 353
decoy portscan
349
distributed portscan
350
flood attack
353
messages
413
port numbers
414
portscan
349
portsweep
350
u-encoding attack
354
undersize-len attack
355
undersize-offset attack
355
unreachables (ICMP)
350
update
configuration overview
prerequisites
63
updating
anti-virus signatures
158
IDP and application patrol signatures
signatures
157
system protect signatures
upgrading
firmware
525
licenses
156
uploading
configuration files
525
firmware
525
shell scripts
527
URI (Uniform Resource Identifier)
usage
CPU
105, 109
flash
106
memory
106, 110
onboard flash
106
sessions
106, 111
user authentication
373
external
374
local user database
427
user awareness
375
356
455
63
159
161
328
NXC5200 User's Guide