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Index: N

computer

16.2.3. Hostnames
16.2.3.1. The /etc/hosts file

user : (see usernames)

nameserver attacks, DNS : 17.3.6.2. DNS nameserver attacks

nameserver cache loading : 16.3.2. Security and Nameservice

NASA

Ames Research Center : F.3.4.22. NASA: Ames Research Center

NASA: Goddard Space Flight Center : F.3.4.23. NASA: Goddard Space Flight Center

National Aeronautical Space Agency : (see NASA)

National Computer Security Center (NCSC) : F.2.1. National Institute of Standards and Technology (NIST)

National Institute of Standards and Technology : (see NIST)

National Science Foundation Network : (see networks, NFSNET)

national security : 26.2.2. Federal Jurisdiction

natural disasters

1.1. What Is Computer Security?

7.1.1.1. A taxonomy of computer failures

7.1.6.1. Physical security for backups

12.2.1.1. Fire

(see also physical security)

accidents : 12.2.2. Preventing Accidents

earthquakes : 12.2.1.4. Earthquake

fires

12.2.1.1. Fire
12.2.1.2. Smoke

lightning

12.2. Protecting Computer Hardware
12.2.1.9. Lightning

natural gas : 12.2.1.5. Explosion

Naval Computer Incident Response Team (NAVCIRT) : F.3.4.44. U.S. Department of the Navy

ncheck command : 5.5.4.1. The ncheck command

-s option

5.5.4.1. The ncheck command
5.6. Device Files

NCSA HTTPD server : 10.3.5. access_log Log File

NCSA server : (see Web servers)

NCSC (National Computer Security Center) : F.2.1. National Institute of Standards and Technology (NIST)

needexpnhelo (sendmail) : 17.3.4.3. Improving the security of Berkeley sendmail V8

needmailhelo (sendmail) : 17.3.4.3. Improving the security of Berkeley sendmail V8

needvrfyhelo (sendmail) : 17.3.4.3. Improving the security of Berkeley sendmail V8

nested directories : 25.2.2.8. Tree-structure attacks

Netgroup table (NIS+) : 19.5.3. NIS+ Tables

netgroups, NIS

19.4.4. NIS Netgroups
19.4.4.6. NIS is confused about "+"
limiting imported accounts : 19.4.4.2. Using netgroups to limit the importing of accounts

NetInfo

3.2.2. The /etc/passwd File and Network Databases
16.2.6.2. Other naming services

Netmasks table (NIS+) : 19.5.3. NIS+ Tables

netnews~firewalls : 21.4.3. Netnews

.netrc file : 10.4.3. Network Setup

Netscape Navigator

encryption system of : 18.4.1. Eavesdropping Over the Wire
random number generator : 23.8. Picking a Random Seed

netstat command

17.5. Monitoring Your Network with netstat
24.2.1. Catching One in the Act
24.2.4. Tracing a Connection
-a option : 17.5. Monitoring Your Network with netstat
-n option : 17.5. Monitoring Your Network with netstat

network connections : 17.3.3. TELNET (TCP Port 23)

network databases : 3.2.2. The /etc/passwd File and Network Databases

Network Filesystem : (see NFS)

network filesystems : 5.5.5. Turning Off SUID and SGID in Mounted Filesystems

Network Information Center (NIC) : 24.2.4.2. How to contact the system administrator of a computer you don't know

Network Information System : (see NIS)

Network News Transport Protocol : (see NNTP)

network providers : 27.2.6. Network Providers that Network Too Well

network services

17. TCP/IP Services
17.7. Summary
23.3. Tips on Writing Network Programs
DNS : (see DNS)
encryption with : 17.4. Security Implications of Network Services
finger : (see finger command)
FTP : (see FTP)
NNTP : (see NNTP)
NTP : (see NTP)
passwords for : 17.4. Security Implications of Network Services
POP : (see POP)
root account with : 17.4. Security Implications of Network Services
securing : 19.1. Securing Network Services
SMTP : (see SMTP)
SNMP : (see SNMP)
spoofing : 17.5. Monitoring Your Network with netstat
systat : 17.3.1. systat (TCP Port 11)
table of : G. Table of IP Services
Telnet : (see Telnet utility)
TFTP : (see TFTP)
UUCP over TCP : 17.3.20. UUCP over TCP (TCP Port 540)

Network Time Protocol : (see NTP)

network weaving : 16.1.1.1. Who is on the Internet?

networks

10Base-T : 12.3.1.2. Eavesdropping by Ethernet and 10Base-T

allowing threats from : 11.4. Entry

ARPANET : 16.1.1. The Internet

backing up

7.2.2. Small Network of Workstations and a Server
7.2.4. Large Service-Based Networks with Large Budgets

backups across : 7.4.5. Backups Across the Net

cables for : 12.2.4.2. Network cables

checklist for

A.1.1.15. Chapter 16: TCP/IP Networks
A.1.1.16. Chapter 17: TCP/IP Services

configuration files : 10.4.3. Network Setup

connectors for : 12.2.4.3. Network connectors

cutting cables : 25.1. Destructive Attacks

denial of service on

25.3. Network Denial of Service Attacks
25.3.4. Clogging

disabling physically : 25.3.3. Signal Grounding

Internet : 16.1.1. The Internet

LANs : (see LANs)

logging across : 10.5.2.2. Logging across the network

logging services of : 10.3.6. Logging Network Services

MANs : 16.1. Networking

mobile computing : 8.7. One-Time Passwords

monitoring with netstat : 17.5. Monitoring Your Network with netstat

NFSNET : 16.1.1. The Internet

packet-switching : 16.2. IPv4: The Internet Protocol Version 4

scanning : 17.6. Network Scanning

security references : D.1.8. Network Technology and Security

services for : 11.1.2. Back Doors and Trap Doors

sniffers : 16.3. IP Security

spoofed connection : 8.5.3.1. Trusted path

TCP/IP : (see TCP/IP, networks)

UNIX and : 16.1.2. Networking and UNIX

UUCP over : 15.8. UUCP Over Networks

WANs : 16.1. Networking

Networks table (NIS+) : 19.5.3. NIS+ Tables

networks, computer : 1.4.3. Add-On Functionality Breeds Problems

Neumann, Peter : 1.3. History of UNIX

newgrp command : 4.1.3.2. Groups and older AT&T UNIX

newkey -u command

19.3.2.1. Creating passwords for users
19.5.4.2. When a user's passwords don't match

news : (see Usenet)

news (user) : 4.1. Users and Groups

newsgroups, defamation/harassment via : 26.4.7. Harassment, Threatening Communication, and Defamation

NEXTSTEP Window Server (NSWS) : 17.3.16. NEXTSTEP Window Server (NSWS) (TCP Port 178)

NFS (Network Filesystem) : 19. RPC, NIS, NIS+, and Kerberos

authentication and

19.2.2. RPC Authentication
19.2.2.4. AUTH_KERB

checklist for : A.1.1.19. Chapter 20: NFS

file permissions : 5.1.7. File Permissions in Detail

find command on : 5.5.4. Finding All of the SUID and SGID Files

-local option : 11.6.1.2. Writable system files and directories

MOUNT : 20.1.1. NFS History

Secure NFS : (see Secure NFS)

server, and UUCP : 15.3. UUCP and Security

technical description of : 20.1.1. NFS History

and trusted hosts : 17.3.18.2. The problem with trusted hosts

-xdev option : 11.6.1.2. Writable system files and directories

NIC (Network Information Center) : 24.2.4.2. How to contact the system administrator of a computer you don't know

nice command : 25.2.1.2. System overload attacks

nice numbers : C.1.3.3. Process priority and niceness

NIS (Network Information Service)

+ in

19.4. Sun's Network Information Service (NIS)
19.4.4.6. NIS is confused about "+"

clients : 19.4. Sun's Network Information Service (NIS)

domains : 19.4.3. NIS Domains

maps : 19.4. Sun's Network Information Service (NIS)

netgroups

19.4.4. NIS Netgroups
19.4.4.6. NIS is confused about "+"
limiting imported accounts : 19.4.4.2. Using netgroups to limit the importing of accounts

Secure RPC with

19.3.2. Setting Up Secure RPC with NIS
19.3.4. Limitations of Secure RPC

spoofing : 19.4.4.5. Spoofing NIS

UDP : 16.2.4.3. UDP

Yellow Pages : 16.2.6.2. Other naming services

NIS (Network Information System)

3.2.2. The /etc/passwd File and Network Databases
3.4. Changing Your Password
19. RPC, NIS, NIS+, and Kerberos
19.4. Sun's Network Information Service (NIS)
19.4.5. Unintended Disclosure of Site Information with NIS

NIS+

3.2.2. The /etc/passwd File and Network Databases

3.4. Changing Your Password

16.2.6.2. Other naming services

19.5. Sun's NIS+

19.5.5. NIS+ Limitations

integrity-checking software for : 19.5.5. NIS+ Limitations

principals : 19.5.1. What NIS+ Does

Secure RPC with

19.3.2. Setting Up Secure RPC with NIS
19.3.4. Limitations of Secure RPC

nisaddcred command : 19.3.1.1. Proving your identity

niscat command : 3.2.2. The /etc/passwd File and Network Databases

nischown command : 19.5.4. Using NIS+

nispasswd command

3.4. Changing Your Password
19.5.4. Using NIS+
19.5.4.2. When a user's passwords don't match

NIST (National Institute of Standards and Technology)

F.2.1. National Institute of Standards and Technology (NIST)
F.3.4.26. NIST (National Institute of Standards and Technology)

NNTP (Network News Transport Protocol) : 17.3.13. Network News Transport Protocol (NNTP) (TCP Port 119)

nobody (user)

4.1. Users and Groups
19.3.2.1. Creating passwords for users

noexpn (sendmail) : 17.3.4.3. Improving the security of Berkeley sendmail V8

noise, electrical : 12.2.1.8. Electrical noise

nonadaptive modems : (see modems)

nonblocking systems : 19.2. Sun's Remote Procedure Call (RPC)

nonce : 23.3. Tips on Writing Network Programs

nonrepudiation : 6.5. Message Digests and Digital Signatures

NORDUNET : F.3.4.27. NORDUNET: Denmark, Sweden, Norway, Finland, Iceland

NOREAD= command : 15.5.2. Permissions Commands

Northwestern University : F.3.4.28. Northwestern University

nosuid : 11.1.2. Back Doors and Trap Doors

Novell : 1.3. History of UNIX

novrfy (sendmail) : 17.3.4.3. Improving the security of Berkeley sendmail V8

Nowitz, David : 15.2. Versions of UUCP

NOWRITE= command : 15.5.2. Permissions Commands

npasswd package : 8.8.2. Constraining Passwords

NPROC variable : 25.2.1.1. Too many processes

NSA (National Security Agency) : F.2.2. National Security Agency (NSA)

NSWS (NextStep Window Server) : 17.3.16. NEXTSTEP Window Server (NSWS) (TCP Port 178)

NTP (Network Time Protocol) : 17.3.14. Network Time Protocol (NTP) (UDP Port 123)

Secure RPC and : 19.3.1.3. Setting the window

NU-CERT : F.3.4.28. Northwestern University

null device : 5.6. Device Files

nuucp account

15.1.4. How the UUCP Commands Work
15.3.1. Assigning Additional UUCP Logins
15.4.1.3. Format of USERFILE entry without system name

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