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The Wire to the Internet
. Network Model . Network Layer Protocols . HTTP, FTP, ... . Network Infrastructure . Cabling, Hubs, … . PC Hardware . PCI, PCMCIA, …. .
DemoPeople Don’t Need To See Paula Abdul
. A 4 Layered Network View
. Physical
. Data (MAC addr, switching)
. Network (IP addr, routing)
. Application (65K conversations possible via
Ports)
. Think like a network device, not the User!
.
.A MAC address is unique for each Network Card (NIC).
IP addressing
Reserved address space.
10.x.x.x Class A.
172.16-31.x.x Class B.
192.168.x.x Class C.
What address to use?.
If is isn’t reserved, you may not get out.
Requesting address space.
ICANN or your ISP.
DHCP.
DNS issues.
IPv6 vs IPv4.
Vendor support.
Is it a real User requirement?.
.
Operating System Support
Remote logins, “shrink wrap” support, file portability, etc.
Decimal2Binary
. What Protocols? . The Internet as most see it (http, https) . File sharing (FTP, SMB) . Terminal Access (Telnet, SSH, X11) . Email (smtp, pop, imap)
. Network Address Translation (NAT) . We all connect as one! . Do you need to NAT?
. Myth: Proxy servers or firewalls . One way Firewall? . I can see you, hopefully you can’t see me.
. Network Elements
. Cables (voice/data)
. Hubs and Switches
. Routers and Firewalls
.
Network Design
. Topology
. Bandwidth
. Applications
. House wiring
. Dial tone = 48 volts
. Ring = up to 150 volts
. Color Pairs
. Why talk about phone wiring?
. Networks start from the wire
. Most older buildings have legacy wiring
. Do you reuse the building wiring?
Your House Wiring
Pair 1
Pair 2
Green
Yellow
Tip
Red
Black
Ring
. Color blind? . Primary Colors/Secondary Colors of bundles . Data cable colors you need to know. (Secondary Colors) . Do you have to remember colors?
. Today most network connects are CAT5 and come color coded.
Primary
Secondary
Colors
Colors
White
Blue
Red
Orange
Black
Green
Yellow
Brown
Violet
Grey (Slate)
100 Pair Cable Bundle Tag Colors
Bundle Num (pair #)
Tagged Color Wrap
1 (1-25)
Blue
2 (26-50)
Orange
3 (51-75)
Green
4 (76-100)
Brown
. What is the difference between Cat 3, 5, 6
. Cables you need to know how to make (Straight Through and Crossover)
. Tools of the trade (toner, crimper, cable checker, scissors)
Straight Through Cable Crossover Cable
RJ-45 PIN
RJ-45 PIN
1 Rc+
3 Tx+
2 Rc
6 Tx
3 Tx+
1 Rc+
6 Tx
2 Rc-
RJ-45 PIN
RJ-45 PIN
1 Tx+
1 Rc+
2 Tx
2 Rc
3 Rc+
3 Tx+
6 Rc
6 Tx
. Hubs . All for one, one for all . Repeater
. Switches . Forwarding based on MAC (bridge) . Auto-negotiation (speed/duplex) . In-line power . Segmentation (vlans) . How are they managed?
. Embedded Web servers
. SNMP (Simple Network Management Protocol)
. What can be managed . Interfaces, Auto-negotiation, segments, broadcasts, etc. . Routing?
. Routers . Forward packets based on Network addresses . Routing protocols . IP addresses/subnets . Broadcast domains . Software vs. ASIC
. FreeBSD, RedHat Linux, etc . Cisco, Linksys, Nokia, etc. . Firewalls . Traffic analysis is based on SRC/DST IP addresses, ports, and/or
packet *******s.
. NAT
. Inbound/outbound Access Control Lists (ACL)
. Software vs. ASIC
Wired vs. Wireless
Media Types (Coax, Twisted Pair, Fiber,
Wireless, Dialup?)
Security – is it a concern?
Speed – How fast is fast!
.
Remember that the slowest link in the network is
the base speed all hosts will talk.
Your cable plant
.
What type of media?
.
Wireless? What is your channel plan?
Types . PCI . PCMCIA . USB
To install the hardware use these general
rules: . PCI – install the card first, then software . PCMCIA and USB – install the software first, then
the hardware
3COM Setup Linksys Setup PCI Card Setup
. Setup a wireless access point . Web interface
. Ping test . PC connected via Cat5 to Access Point . PDA connected via Wireless
. Overview of network level protocols, architecture, and design
. “Under the Hood” look at real network components
. Demo of configuration and operation of wireless and wired links