Study Guide for the Midterm Test
Q) Define the following:
VBR:
CBR:
Virtual Circuit:
Permanent Virtual Circuit (PVC):
Switched Virtual Circuit (SVC):
TE1:
TE2:
NT1:
NT2:
LCN:
Local loop:
Toll network:
CO:
CSU/DSC:
DCE:
DTE:
CPE:
PPP:
LCP:
PAP:
CHAP
NCP:
Q) Compare between T1 and E1 lines in terms of the following:
1) Speed :
2) Number of slots:
3) Country uses each one:
Q) Compare among the following of services in terms of OSI model layers:
T1, X.25, ISDN ( I need to know which layers are supported by each one)
Q) Draw the frame format that is supported by T1 line. (T1 line PDU)
Q) List 4 examples about where you can use the ISDN service.
Q) What is the difference between VBR and CBR?
Q) List the three different flow control methods and compare among them.
Q) What is the difference between fixed ( static) and adaptive (dynamic)routing? ( two main differences)
Q) Fill out the next table based on the given diagram for an ISDN network ( what are these reference points):
A
B
C
D
Q) Fill out the next table based on the given diagram for an ISDN network ( what are these devices):
AB
C
Compare between Dedicated links and switched links (give examples about each)
Q) Fill out the following table by checking the appropriate column for each service:
Service name / Dedicated-line / Packet switched / Circuit switched / Cell-switchedT1 Lines
ISDN
DSL
Frame Relay
T3 Lines
Fractional T1 Lines
Phone Netwrok
X.25
E1 Lines
ATM
SONET
J1 Lines
Q) What is the difference between circuit-switched and packet-switched services
Q) What are the components of PPP protocol at the three different OSI model layers: Physical, data link, and network layer.
Q) What are different phases that PPP goes through in order to handle session establishment. What happens at each one? Which protocol does the function of each phase?
Q) Describe the frame format used by PPP protocol. ( the six fields that compose it).
Q) what are the two main topologies supported by T1?
Q) What is the meaning of multiplexing?
Q) what are the two main authentication protocols used by PPP. Compare between them.
Q) Fill out the following table based on the given diagram:
Letter / Description
A
B
C
D
E
Q) What is the main difference between connection-oriented and connectionless systems. List two examples about services for each one.
Q) What is the benefit of Virtual private network:
Q) What is the benefit terminal service in Windows 2000 server.
Q) What is the difference between AUX port and CONSOLE port in the router.
Q) What are the three different ways to access a router remotely.
Q) List the OSI model layers from top to bottom.
Q) Write down the encapsulation steps in order.
Q) what is the difference between BRI and PRI isdn services
Q) Fill out the following table by checking the appropriate column for each service:
Service name / PVC / SVC / Does not applyT1 Lines
ISDN
DSL
Frame Relay
T3 Lines
Fractional T1 Lines
Phone Netwrok
X.25
E1 Lines
ATM
SONET
J1 Lines
Q17) What is the difference between T1,E1 and J1 lines?