CCNA Notes

2^1=2, 2^2=4, 2^3=8, 2^4=16, 2^5=32, 2^6=64, 2^7=128, 2^8=256

2^9=512, 2^10=1024, 2^11=2048, 2^12=4096, 2^13=8192, 2^15=16384

subnetting is walking/turning 0's to 1's
ip + subnet mask determines if two devices can talk with each other in same network eg 10.0.10.3 and 10.0.0.2 can not with 255.255.255.0 but can with 255.255.0.0
A(0) 1.0.0.1 B(10) 128.0.0.1 C(11) 192.0.0.1
127.x.x.x loopback
private 10, 172.16-31, 169.254(MS), 192.168

172.16.0.0 /24     2^8=256, 2^8=256
subnet 0.0 1.0 2.0 ... 255.0

ip address 172.16.45.14 /30     2^6=64, 2^2=4
172.16.45.12 network, 172.16.45.15 broadcast

Administrative dist
connected=0 static=1 EIGRP=90,170 IGRP=100 OSPF=110 IS-IS=115 RIP=120

Configuring a Network 01
VLSM Design
ALs

1. Physical - cables, signals
2. Data Link - Frames Mac LLC Switch
3. Network - Packets, Logical Addressing, routers
4. Transport - Segments TCP UDP
5. Session
6. Presenation
7. Application

# sh controllers serial 0/0
# sh ip interface s0/0
# sh ip interface brief   administratively down then no shutdown
# sh int fa0/0   layer 1, 2
# sh protocols   - summary 1,2

erase startup-config
sh startup-config
reload
sh running-config
copy running-config startup-config   saving
copy run start

Configuring passwords
line consol 0, password xxx, exit   Consol
line vty 0 ?, line vty 15, password xxx, Exec-Timeout 30 30, login
  telnet

clockrate bps, bandwidth Kbps
int s1, encap ppp, clockrate 64000   serial interfacee for frame relay

# config t   (config)#
hostname R1
service password-encrypt
no ip domain-lookup
enable secret xxx
banner login # banner message #
banner motd frac


host table
ip host R1 10.0.0.3
config DNS
ip domain-lookup
ip name-server 192.168.0.5
ip domain-name fluxion.com

Hyperterminal - COM1 9600
Telnet to router - connect ether to ether, put router and computer on same network, set password on router, terminal monitor to see debug messages

sh cdp
show cdp neighbor detail
no cdp run   turn off
config t, int s0/0/0, no cdp enable   turn off on interface

clock set 12:58:30 18 October 2008
sh clock
sh terminal
sh history
terminal history size 30


config t, int s0, ip address 1.1.1.3 255.255.0.0, no shut, description Chicargo

sh ip route   display the routing table
sh ip protocols eg find autonomouse numbers
router eirp 10, Maximum-path 6, variance 2, network 10.0.1.0
debug ip eigrp
sh ip eigrp neighbor
sh ip eigrp topology
clear ip route *

debug ip rip
u all - turn of all debug

2100 - Rom monitor, 2102 default, config-register 0x2101, reset
sh version

boot system flash x.bin
boot system ftp x.bin 10.1.1.6
boot system rom

locking a port to a mac address
int fa0/15, switchport mode access, mac-address aaaa.bbbb.cccc, switchport port-security violation shutdown


802.
11a 5GHz, 54Mbps < (50,200)feet, 12 non-overlapping channels, 11h: 23 non-overlapping channels
11b 2.4GHz, 11Mbps < (150,350)feet, 3 non-overlapping channels
11g 2.4GHz 54Mbps < (100,300)feet, 3 non-overlapping channels

ftp 20,21
telnet 23
SMTP 25
DNS 53
POP 110
NNTP 119
HTTPS 443
DNS 53
DHCP 67,68
TFTP 69
NTP 123
SMTP 161


TODO move to ssh notes
Port forwarding
SSH Tunneling