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# Index: N

name service
  16.2.6. Name Service
  16.2.6.2. Other naming services
  security and : 16.3.2. Security and Nameservice
name-value pairs in BNU UUCP : 15.5.1.2. Name-value pairs
named daemon : 16.2.6.1. DNS under UNIX
named nameserver : 17.3.6.2. DNS nameserver attacks
named-xfer program : 16.2.6.1. DNS under UNIX
named.boot file
  17.3.6.1. DNS zone transfers
  17.3.6.2. DNS nameserver attacks
names
  choosing UUCP : 15.5.2. Permissions Commands
  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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