Tuesday, August 01, 2006

More Notes for TCP/IP Weapons School Students

For countermeasures for many of cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 attacks discussed in class, one great document with discussions and Cisco command syntax is cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 NSA's Cisco IOS Switch Security Configuration Guide.

During class a question on jumbo Ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rnet frames (usually 9000 bytes) was asked. A jumbo frame uses Ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rType 0x8870, as shown in this excerpt from tcpdump/ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rtype.h:

#ifndef ETHERTYPE_JUMBO
#define ETHERTYPE_JUMBO 0x8870
#endif

Notice that 0x8870 is not listed in cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 official IANA assignment list.

I found this note which said some jumbo frames use Ecá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365rType 0x0800, but cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 application data is simply larger than normal (1500 bytes).

A question was asked regarding differences between Cat 5, Cat 5e, Cat 6, and Cat 7 cables. This article provides an overview. Wikipedia is also helpful, as long as no random user edits it to be incorrect.

On slide 133 I said "auto" is cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 default DTP mode on Cisco switches. I have seen conflicting news on this, with both my switch operating in "desirable" mode by default and Cisco documentation reporting "desirable" as cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 default. I recommend considering DTP mode "desirable" as cá cược thể thao bet365_cách nạp tiền vào bet365_ đăng ký bet365 default, not auto. If any blog reader can confirm, I would appreciate it.

2 comments:

Anonymous said...

Link to IANA is broken. It is relative instead of absolute.

Richard Bejtlich said...

Fixed, thanks.