CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
JULY15
ASSESSMENT_CODE MC0087_JULY15
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
8067
QUESTION_TEXT
Explain the four layers of the DARPA model.
SCHEME OF
EVALUATION
The four layers of the DARPA model are application, transport, internet
and network interface.
i.Network interface layer: The Network interface layer sends TCP/IP
packets off the network medium.
ii.Internet layer: the internet layer responsibilities include addressing,
packaging and routing functions. The internet layer is analogous to the
network layer of the OSI model.
iii.Transport layer: The transport layer provides the application layer
with session and data gram communication services. the transport layer
encompasses the responsibilities of the OSI transport layer.
iv.Application layer: The application layer allows applications access
the services of the other layers and it defines the protocols that
applications use to exchange data.
(2.5 marks each)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
8068
QUESTION_TEXT
Explain different characteristics of Internet Control Message Protocol
(ICMP).
SCHEME OF
EVALUATION
i.ICMP uses IP as through ICMP were a higher level protocol.
ii.ICMP is used to report errors, not to make IP reliable. Data grams
can still be undelivered by the higher level protocols using IP services.
iii.ICMP cannot be used to errors with ICMP messages.
iv.For fragmented datagram’s, ICMP messages are only sent about
errors with the first fragment.
v.ICMP messages are never sent in response to datagrams, with a
broad cost or a multicast destination address.(2 marks each)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72553
QUESTION_TEXT
Explain the TCP/IP protocol suite.
Application
Transport
SCHEME OF EVALUATION Internetwork
Network interface and L/W
(each carries 2.5 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72556
QUESTION_TEXT
Explain the operations of distance vector multicast routing
protocol.
SCHEME OF
EVALUATION
Vector multicast routing protocol
Neighbor discovery
Routing table creation
Dependent downstream routers
Designated forwarder (5 marks)
Building and maintaining multicast delivery trees
marks)
(5
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
72558
QUESTION_TEXT
Define firewall concept. Explain four important examples of
firewalls.
SCHEME OF
EVALUATION
A Firewalls illustration (2 marks)
Packet filtering firewall (2 marks)
Dual homed gateway firewall (2 marks)
Screened host firewall (2 marks)
Screened subnet firewall (2 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
117782
QUESTION_TEXT
Explain various types of firewalls employed in TCP/IP.
i.
ii.
SCHEME OF EVALUATION iii.
iv.
Packet filtering firewall (2.5 Marks)
Dual homed gateway firewall (2.5 Marks)
Screened host firewall (2.5 Marks)
Screened subnet firewall (2.5 Marks)