1. Review
End of Semester

2. Review First Half of Semester

3. First Half What is infrastructure Computer Basics Number systems
Data storage
Numbers
Characters

4. First Half Networks MAC addresses IP TCP/UDP ARP
Only way one computer can connect to another
Unique addresses for all NICs IP
Unique addresses for computers
Within a network
IPv4 ~4 billion addresses in 5 Classes
IPv6 ~3.4x1038 addresses
TCP/UDP
Ways to transmit data
Assured delivery (TCP)
Low overhead (UDP)
ARP
Find the MAC address of a computer
Local network

5. First Half Networks Switches allow connections between computers
In a local network
Only computers in their (logical) network are allowed to directly communicate
Routers
Transmit data from one network to another
NAT
DHCP

6. First Half DNS Gives "human" names to computer addresses
Is not "really" needed
Makes the Internet human friendly
Arguably the most important service on the Internet

7. First Half HTTP HTML Allows retrieving of "HyperText" material
Language of the HyperText
Formatting
Referencing other docs

8. Second Half of Semester

9. Last Half Web Servers Mail Servers Apache IIS HTTP server NGINX
Many others…
Mail Servers
SMTP
POP and IMAP

10. Last Half Telenet, et. Al. SSH Remote control over network
rsh, rlogin
Remote file access
rcp, ftp
Typically unsecure
But not entirely obsolete!
SSH
Secure network protocols
ssh, scp, sftp, etc…

11. Last Half Storage How a disk works RAID LVM Operational parameters
0 – striped
Bigger, faster
Single failure complete data loss
1 – duplicated
Wasted space
No loss if drive failure
5,6 – redundancy though parity
Can survive one or more drive losses
LVM
Can manage drives

12. Last Half Distributed Files Systems NAS/SAN Access other systems data
NFS, AFS, SMB
NAS/SAN
File access (NAS)
Multiple access by various users/systems
By files
Block access (SAN)
Only one system may access
Like an unformatted hard drive

13. Last Half SNMP LDAP SPAM Monitor/Control Network resources
Client/server
Monitors are the clients
Network devices are the servers
LDAP
Directory Protocol
SPAM
Indirectly impacts Infrastructure

14. Last Half Network Computing Backup VNC VPN
Remote access to a computer
Accesses the GUI
VPN
Extending a secure network to remote locations
Accesses the resource
Backup
Critical to ensure data is kept “safe”
Often overlooked or ignored