ccna Flashcards
Learning for CCNA (27 cards)
CCNA
What are the two advantages of using routers in your network:
They dont forward broadcasts by default (break up broadcast domains)
They can filter the network based on layer 3 (Network layer) information
CCNA
Four router functions in your network can be listed as?
Packet switching
Packet filtering
Internetwork communication
Path selection
CCNA
What does a switch do to a broadcast and collision domain
Switches create separate collision domains but a single broadcast domain.
CCNA
What do routers to the broadcast for each interface
Routers provide a separate broadcast domain for each interface.
CCNA
Bridges/Switches segment networks, but what do they not do?
Although bridges/switches are used to segment networks, they will not isolate broadcast or multicast packets.
CCNA
What does osi stand for
Open Systems Interconnection
CCNA
What are the Advantages of using the OSI layered model
t divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
It allows multiple-vendor development through standardization of network components.
It encourages industry standardization by defining what functions occur at each layer of the model.
It allows various types of network hardware and software to communicate.
It prevents changes in one layer from affecting other layers, so it does not hamper development.
CCNA
What are the 7 layers of the OSI
Application layer (layer 7) Presentation layer (layer 6) Session layer (layer 5) Transport layer (layer 4) Network layer (layer 3) Data Link layer (layer 2) Physical layer (layer 1)
CCNA
What does the tterm reliable networking mean when used t the Transport layer
It means that acknowledgments, sequencing, and flow control will be used.
CCNA
What is the purpose of flow control
The purpose of flow control is to provide a means for the receiver to govern the amount of data sent by the sender.
CCNA
What characteristics does a service have to be considered connection-oriented
A virtual circuit is set up (e.g., a three-way handshake).
It uses sequencing.
It uses acknowledgments.
It uses flow control.
CCNA
What are the types of flow control
buffering, windowing, and congestion avoidance.
CCNA
How can a host improve communication session is the host fails to receive all segments
by decreasing the window size
CCNA
What are the starting octets form Class A, B & C networks
Class A 1 - 126
Class B 128-191
Class C 192-223
CCNA
Whats the difference between tcp and UDP
TCP Builds connections, uses sequences and is reliable
UDP is connectionless, best effort deliviery and is unreliable
CCNA
What does LLC Stand for and what osi layer does it reside
It stand for Logical Link Control and it resides in the Network Layer
CCNA
what is the standard ethernet uses
CSMA / CD Carrier Sense Multiple Access / Collision Detection
CCNA
what are the 3 methods of communicating using ethernet
Unicast, Broadfcast & multicast
CCNA
what are the two types of ethernet cable
straight through and crossover
CCNA
What Binary Decimal numbers are useful in subnetting
10000000 = 128 11000000 = 192 11100000 = 224 11110000 = 240 11111000 = 248 11111100 = 252 11111110 = 254 10000000 = 128
CCNA
When a collision occurs on an ethernet lan what happens
A Jam signal informs all devices that a collision occured
The collision invokes a random backoff algorythm
each device on the ethernet segment stops transmitting for a short time until the timers expire
All hosts have equal priority to transmit after the timers have expired.
CCNA
What are the effects of having CSMA/CD network sustaining heavy collisions
Delay,
Low throughput
Congestion
CCNA
Which of the following is a digital-interface device used to connect a router to a digital circuit like a T1?
a. A channel service unit/digital service unit (CSU/DSU)
b. A DTE
c. An Ethernet card
d. None of the above
Answer A
A channel service unit/digital service unit (CSU/DSU) is a digital-interface device used to connect a router to a digital circuit like a T1
CCNA
Full duplex ethernet can be used in 3 situations
With a connection from a switch to a host
With a connection from a switch to a switch
With a connection from a host to a host using a crossover cable
