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OSI Model, Mac address, Subnet Mask, Subnetting, Java Statements, TCP,…
OSI Model
Lower Layers
Transport
TCP/IP, Port
Network Layer
IP Address
Routers
Data Link Layer
Ethernet MAC address
Switches
Physical Layer
Hubs
Upper Layers
Session
Presentation
Application
Encapsulation
Down the layers when sending and up the layers when recieving
Mac address
Attached to hardware
Permanent
48 bits, hexadecimal
ip is where
mac is what device
Used in tandem with ip
ARP
First asks for mac address
Subnet Mask
Host address
Host address
non 255 subnet mask value
Initial broadcast
Default gateway
slash notation
Subnetting
CIDR
Route aggregation
More efficient routing
IP Range assignment
Calculating # of subnets
Calculate # of hosts
ip subnet-zero
current ccna assumption
/31 subnet
Point to point
/30 in exam for 2 hosts
How do 2 hosts on a different subnets talk to each other?
FLSM
VLSM
Java Statements
Switch
Classes that switch supports
Case statement values
Literals, enum constants or final constants
break statement
using return statement as alternative
Loops
while
do while
for loops
infinte for loop
Optional components
for loop where you increment multiple variables at once
Can only initialize variables of the same type
If-then
If-then else
ternary operator
nested conditions
TCP
3 way handshake
Syn
Syn-ack
Ack
sequence #
Won't send acknowledgement back to sender if packet is not correct
Flow control
TCP ports used
Ports
Ranges
Well known ports
reserved ports
source ports
Source
Destination
Socket
Syslog
Set up syslog server
uncomment conf files to set lines
Send event messages to a certain server
Severity levels
Packet Switch
Output buffer
Packet loss
Store and forward transmission
Forwarding Table
UDP
No handshake connection
No flow control
UDP prots used vs
Network Layer
IP Header
time to live
Quality of service
Internet protocol
IP Traffice Types
Broadcast
Not forwarded by routers
Goes to. every device in switch
Unicast
Doesn't make copies
Multicast
Connecting to a Cisco Device
Command line connection
Telnet
Not as secure?
SSH
AAA Server
Authentication, Authorization and Accounting
Cat 5 Cable
8 colored wires
Colors twisted to reduce electromagnetic field
Moving Data
Circuit Switching
Phone lines
Real time data based
Packet switching
TCP/IP
Can have delays
Multiplexing
TDM
Sync vs Async
FDM
Fusion into groups
Ip Address
Dynamic Addressing
Static Addressing
ARP
Ask for ip first
ask for mac address
ARP Cache
IP Address Classes
Class 127 - localhost
Class A range
TCP/IP Stack
Protocol Data Unit
Transport Layer
Flow Control
Reciever can't handle constant messages from sender
Session Multiplexing
Flipped ports
Port above 1024
Static vs Dynamic IP Addressing
DHCP
Scope
public request
Broadcast a request
Lease
Device removed
Reservation
Mac address
Built into routers