Network Elements, Routing Flashcards
The factors that determine the nature of a LAN are
1) Topology
2) Transmission medium
3) Medium access control technique
All of them
LAN relates to ______ w.r.t ISO model
1) higher layer protocols
2) lower layer protocols
2) lower layer protocols
(higher layer protocols are independent of network architecture)
The functions associated with providing service to the LAN users comprise
1) LLC
2) MAC
3) both
4) none
both
MAC: Medium Access Control
LLC: Logical Link Control
A special type of tree topology
1) star
2) bus
3) ring
bus
tree can be considered as multiple interconnected bus networks
To implement ring network topology, one uses
1) FDDI
2) SONET
3) Token Ring
All of them
FDDI: Fiber Distributed Data Interface
SONET: Synchronous Optical Network
In _________ topolgy, medium access control is needed to determine when each station may insert frames
1) star
2) bus
3) ring
4) tree
ring
The two alternatives for the operation of the central node in star topology
1) to operate in broadcast fashion
2) ________
to act as a frame switching device
The two alternatives for the operation of the central node in star topology
1) ________
2) to act as a frame switching device
to operate in broadcast fashion
MAC (Medium Access Control) can be implemented in
1) centralized fashion
2) distributed fashion
both
Round robin is
1) centralized fashion
2) distributed fashion
may be centralized or distributed
Polling is an example of
1) centralized fashion
2) distributed fashion
centralized fashion
Reservation is
1) centralized fashion
2) distributed fashion
may be centralized or distributed
For bursty traffic, an appropriate MAC technique is
1) round robin
2) reservation
3) contention
contention
The MAC frame includes
1) LLC PDU
2) CRC
both
LLC: Logical Link Control
CRC : The cyclic redundancy check field ( also known as the frame check
sequence, FCS, field)
MAC and LLC stand for
MAC: Medium Access Control
LLC: Logical Link Control
The ________ layer is responsible for detecting errors and discarding any frames that are in error
1) MAC
2) LLC
MAC layer
The ____ layer optionally keeps track of which frames have been successfully
received and retransmits unsuccessful frames
1) MAC
2) LLC
LLC layer
Ethernet access method
1) CDMA
2) CSMA
3) CSMA/CD
3) CSMA/CD
Carrier Sense Multiple Access/Collision Detect
IEEE 802.3 Medium Access Control
_______ include a repeater function
1) Passive hubs
2) active hubs
active hubs
Advantages of the newer 10 BaseT hubs are
1) Each port has exclusive access to its bandwidth (no CSMA/ CD)
2) Hubs may be cascaded to add additional ports
3) include an SNMP (Simple Network Management Protocol) agent
4) used to connect workgroup hubs to form a larger network
1,2,3
4 is for switch
SNMP stands for
Simple Network Management Protocol
They establish logical connections between ports based on MAC
addresses
1) layer-2 switches
2) layer-3 switches
layer-2 switches
?? (layer-2 switches: network address)
Use ______ switches for segmenting existing network into smaller collision domains to improve performance
1) layer-2 switches
2) layer-3 switches
layer-2 switches
____ are based on routing
technologies
1) layer-2 switches
2) layer-3 switches
layer-3 switches
(layer-2 switches are based on bridging technologies)
____ are based on bridging
technologies
1) layer-2 switches
2) layer-3 switches
layer-2 switches
(layer-3 switches are based on routing technologies)
They establish logical connections between ports based on network
addresses
1) layer-2 switches
2) layer-3 switches
layer-3 switches
(layer-2: MAC address)