Flashcards in Chapter 1 - Network Technologies Deck (59)
what is OSI?
what are the 7 layers?
open standards interconnection
what is the job of the physical layer?
defines electrical, mechanical, and procedural aspects of communication
what is the job of the data link layer?
what about its 2 sublayers?
defines how we put data on the wire
2.1 - logical link control provides general path to present the communication to the next layer of the model
2.2 - media access control examines the physical address presented to it and addresses packets that it sends
what is the job of the network layer?
what is the primary protocol of the network layer?
defines the logical addressing of computers and devices on the network
IP - internet protocol
what is the job of the transport layer?
defines the connection methods for communication between two devices
what is the job of the session layer?
establishment, maintenance and termination of computer sessions
what are the jobs of the presentation layer?
there are 4 of them
translation of data sent over the wire
format, encryption, compress (all 3 of these are on the data to be sent)
what is the application layer?
what is this layer's most common protocol?
collection of protocols that the user utilizes to begin to put data into the system and eventually onto the wire
HTTP - hypertext transfer protocol
state the 4 layers of the TCP/IP model and pair them against the OSI model
OSI - 7.application, 6.presentation, 5.session, 4.transport, 3.network, 2.data link, 1.physical
TCP/IP - 4.application, 3.transport, 2.internet, 1.network access
what is the job of the network access layer of TCP/IP model?
defines methods of putting data onto the wire and defines what that wire can be
what is the job of the internet layer of TCP/IP?
defines the logical communication links between two or more computers
what is the job of the transport layer in TCP/IP? in other words, what are the 2 protocols here?
TCP - transmission control protocol, guaranteed connection-oriented communication
UDP - user datagram protocol, broadcast best-effort communication
what are the jobs of the application layer of TCP/IP model? there are 3 of them
defines protocols user is using
translation in the network
connection methods for communication
what is EUI-64 full name?
what is it replacing?
extended unique identifier - 64
replacing MAC-48 addresses
looking at the OSI model, what are the different packet terms for each layer?
application - data
presentation - data
session - data
transport - datagram
network - packet
data link - frame
physical - bit
what is a switch?
how does it work?
2 things it is useful for?
layer 2 network device
learn the MAC address of all devices, connected to it to control traffic flow
1.segment the network to decrease traffic
2.create VLANs to improve flexibility of network design
what is a router?
what type of addresses does it use?
what type of table does it use?
2 ways the routing table is built
layer 3 network device, allows us to reach the internet
what is a multi-layer switch?
a switch with layer 2 AND layer 3 capabilities
what's the difference between active and passive hubs?
active - plugged into a power source, it can amplify the signal
passive - only provides connectivity
how are bridges similar to switches?
how are they different from switches?
explain the 2 types of bridges
can learn MAC addresses
1.transparent bridge - connects two dissimilar networks, but is invisible to them, offers no translation
2.source routing - performs translation between 2 dissimilar networks
IPv4 is 32 bit with a ____ ____ format.
tell me the 1st octet ranges for classes A,B,C,D
A - 1-126 (127)
B - 128-191
C - 192-223
D - 224-239
tell me the private IP address ranges and their default subnet masks.
A - 10.0.0.0-10.255.255.255 255.0.0.0
B - 172.16.0.0-172.31.255.255 255.255.0.0
C - 192.168.0.0-192.168.255.255 255.255.255.0
starting with decimal format go 0 thru 15, then do it again in binary, then again in hex
write it out!
how many bits in IPv6?
successive fields of zeroes are written as what?
how big is 2^128?
how would you describe a MAC address format?
6 pairs of hex characters separated by a dash OR space
what does subnetting create?
give quick explanations for unicast, multicast, broadcast
what does an APIPA address begin with?
unicast - one source address and one destination address
multicast - one source to many destinations
broadcast - one to all
when looking at the most common routing protocols, what are the 3 main categories?
within these categories, what are the 4 most common types?
link state - OSPF, IS-IS
distance vector - RIP and RIPv2
how is its metric more sophisticated than RIP?
enhanced interior gateway routing protocol
a cisco proprietary protocol, combines distance vector with link state protocols
uses connection bandwidth and delay
what is OSPF?
what algorithm does it use?
what's its big advantage?
T/F: the most common link state protocol
open shortest path first
uses the shortest path first algorithm, from Dijkstra
FAST convergence when there's a change in the network