books every network operator should read?

I'd like to make a list for the wiki of books that are thought highly of by the network community. What books stand out for you as being excellent? If you could only own 5 network related books, what would they be?

Feel free to reply to me offlist - I'll post a summary after a few days.



Internet Routing Arch.

Routing TCP/IP vol.1

Cisco LAN Switching or Any other LAN switching book

Troubleshooting Routing Protocols by Zaheer Aziz

Cisco ISP essentials

Some chapters of "IOS software Arch"