ICND1 Flashcards
Pass ICND1and ICND2 exams
Segments operate at what layer of the OSI model?
Transport
Some People Fear Birthdays
Segments Packets Fragments Bits
Please Do Not Throw Sausage Pizza Away
Physical Data link Network Transport Session Presentation Application
What does reliability mean in the network?
How dependable is the network.
What does availability mean?
Is the network there.
What does topology mean?
What is the layout of the network.
What device operates at the physical layer 1?
Hub or repeater or bit spitter
What devices operate at the data link layer 2?
switches and bridges
What are layer 2 addresses called?
mac addresses
What devices operates at the network layer 3?
routers
What addresses operate at this layer?
IP addresses
What does the layer 4 provide?
TCP for reliable or UDP for unreliable transmissions
What happens at layer 5 session layer
establishes sessions.
What happens at layer 6 presentation layer?
formatting of data, translation of one data format to another
What happens at layer 7 application layer?
provides network services to the user: email, ftp, etc.
Some People Fear Birthdays
Segments, Packets, Frames, Bits
network layer protocol data unit
packet
data link layer protocol data unit
frame
transport layer protocol data unit
segment
physical layer protocol data unit
bits
application, presentation, session protocol data unit
data
local broadcast address -all hosts
255.255.255.255
directed broadcast address
10.255.255.255 - directed to all hosts on a network all 1’s in host bits
reserved ip address network
all 0’s in host bits.
reserved ip address broadcast
all 1’s in host bits.
DHCP - DORA
Discover , Offer, Request, Acknowledgement messages
Well known , Registered, Dynamic ports
1 -1023, Lotus mail 1024- 49151, sourc ports 49152 - 65535
Switches increase the number of collision domains which ______ the number of collisions.
decrease
Hubs create ____ big collision domain
one
A packet is also called a _______
datagram
Give another name for a switch
transparent bridge
A bridge is also called an ________
extender