Network protocols
TCP management of connections between computers
UDP same role as TCP, but with fewer features, connectionless
both use ports
IP How data is addressed from source to destination, and reassembly
IP v4/IPv6
32bit (232=28*28*28*28) to 128 bit
TCP/IP error correction and guarantee of delivery
Class A 28 for number of networks (~256), and 28*28*28 for number of hosts (~16.7 Million)
Class B 28*28 for number of networks (~65000), and 28*28 for number of hosts (~65,000)
Class C
28*28*28 for number of networks (~16.7 Million), and 28 for number of hosts (~256)
Subnet internally rearranging the hostid portion of IP address, so instead of 28*28... ...26*210
Subnet Mask indication of how your organization subnets, such as 255.255.0.0 for class B
DNS Speed Dial or Phone book for IP addresses
DHCP Dynamically assigning IPs as needed
HTTP connection between web client and server
FTP used to send and recieve files
NNTP Discussion groups
Telnet remote terminal session
SMTP Simple Mail Transfer
VoIP Voice over IP, issues include no guarantee, out of sequence, and little QoS in use
IPX/SPX Novell, ethernet, but chatty
NetBIOS/NetBEUIIBM and Microsoft LANs, non routable
AppleTalk
Ethernet SubNetwork Access Point, SNAP |
Directory Services/Permissions
File sharing
Printer Sharing
eMail
Centalized Virus Protection
Forrests, Roots, Trees, and Leaves
Redundancy
Old Windows, Novell: Primary Backup
New Windows Multimaster
Novell eDirectory
Microsoft Active Directory
X.500
Directory service for use on the whole Internet
CN=user name OU=department, division, O=Organization, C=Country
LDAP , subset of X.500
From My notes on Dynamic Disks/RAID
Raid 0 Minimum two disks, mirrored, no fault tolerance
Raid 1 Minimum two disks, stripped, basic fault tolerance
Raid 3/4 Minimum three disks, parity drive can fail
Raid 5 Minimum three disks, any drive can fail
Raid 6
Minimum four disks, any two drives can fail
Dynamic Disks: resize particitions and volumes
Not for dual boot or Linux
right click on on Disk 0 to convert (one way) |
Remote Access
Broad Traveler
Narrow Traveler
Remote Office User
Remote Office Group
Access required:
email
shared files
centralizxed applications
Internet Access
Intranet access
Bandwidth issues
Remote Node vs. Remote control (join network vs. take over computer on network)
Dial in support (modem)?
toll, access speeds, globabl access
VPN
PPP
PPTP
IPSec
SSL
|
Securing your network
Guard
secrets,
personal information,
software,
network itself, and
data
Internal Users
Account Security
Guest
Administrator account
Know how to disable account or access
Train users, sign off, document
Password security
change frequency, and reuse
complexity (Dictionary words)
Intruder detection
Limits on log in availablility
Alternatives to passwords
Permissions
Create Read Change Full control
User Education
External Threats
Front door, back door, DoS
DMZ, Proxy
Virus, Worm, Trojan, and Logic bomb
|
Disaster Recovery (Light coverage on test, mainly backup and restore)
Disaster Recovery Plan,
Disaster recovery Needs, Considering Scenarios, Communications, and
Off site storage
Backup and Restore
Full backup, everything everytime
Incremental, all files that have changes since last backup, fewer files faster to make, slower to restore
Differential, all files that have changes since last backup, more files, slower to make, faster to restore
Not in book, but need to be covered: Grandfathering and tape rotation; UPS |
R. Craig Collins > CPMT
2449 > Review 2