Mehran University of Engineering Technology Jamshoro

Institute of Information Technology

Department of CS&SW

Mid-Term test of CCNW

30 Minutes

Class ID:_____________

________________________________________________________________________

1. Which of the following do you think you can connect over an internetwork?

A. LAN           B. WAN          C. Computer Systems               D. Software

2. Which of the following do you think a repeater does?
1. It converts data from one protocol to another.
2. It regenerates and propagates the data.
3. It analyzes the address of the packet and sends the packet to destination.
3. A bridge forwards the data packets based on ___________ addresses.
4. Bridges can be used to filter traffic.                    T/F
5. Ethernet switches offer __________________  dedicated bandwidth to LAN segments.
6. The lower two OSI model layers are implemented with 
1. Hardware         b.    Software               c.  Hardware and Software

7.   All network devices implement all seven layers of OSI model.                T/F

8.  Assume that System A has information to send to System B. Which of System A’s seven layers do u think the application program communicate with
1. 3                      b.   6                c.  7                 d. 1 & 2

9. There are Two Systems A and B. the primary concern of  layer 6 in System A is to communicate with
1. Layer 7 in System A
2. Layer 5 in System A                 c.  Layer 6 in System B
10. Each layer’s protocol exchange information, called protocol data units (PDU), b/w _____________________  layers.
1. Adjacent                      b.  Peer
11. The ______________ layer is said to be the service user while the ____________ layer is service provider.
12. What happen to the IP packet when it is passed down from the network layer to the “ Host-to-Network Layer”?
1. It adds it own header to IP packet.
2. It strips the network layer header from the packet.
3. It passes it directly to the physical layer without modifying it any way.
13. Data link layer is responsible for providing reliable transit of data across a  _____________ link.
1. Logical             b.  Physical
14. Two separate active LAN’s can have same MAC address.                   T/F
15. MAC address is a _________ bit address.
16. Router use _________________ to determine an optimal path to destination.
17. During data transfer using TCP , the two machines continue to communicate with their protocol software to verify that data is received correctly.  T/F
18. Sessions are Logical connections b/w network devices.             T/F
19. Do u think that the presentation layer is concerned with the data structure used by program?                                              T/F
20. The presentation layer is responsible for data encryption.                       T/F
21. Do u think that the application layer provides services to any other OSI layer.  T/F
22. Which of the following is true for bus topology.
1. Each device is directly linked to all other devices.
2. Devices are linked in circular fashion, each device being linked two other devices.
3. Devices r directly connected to a central backbone.
23. The 10Base5 wiring standard is known as _____________________ Ethernet.
24. The 10BaseT wiring standard carries Ethernet frames on ___________________ .
25. What do think a transmitting device does if it recognizes a collision?
1. It ceases all transmission.
2. It sends out jamming signal.
3. It continue to transmit.
26. Logically a token ring network is a ____________ but it is physically laid out as a __________________.
27. What do think a token ring network can have more than eight stations?  T/F
28. What do think a token ring network use MAC addresses.                     Yes/No
29. Token ring networks r very porn to collisions.                            T/F
30. IP datagrams r guaranteed to arrive at their destination in the sequence in which they were sent.                                                                                 T/F
31. What TCP do?
1. It initiates handshaking.
2. It controls packet sequencing.
3. It exchanges packets without acknowledgements.
4. It performs flow control.
5. It handles errors.
32. Every time a route passes through _______________ is deemed to be a hop.
1. A network.             b. A network Link              c.  A internetwork node.
33. Routing algorithms can base route selection on multiple metrices.            T/F
34. Node address exist at __________________ layer of OSI model.
35. A distance vector algorithm knows the exact topology of internetwork.  T/F
36. In link state each router send its entire routing table to its neighbors.        T/F 
37. Which type of routing algorithm requires more CPU power and memory.
1. Link State                                 b.  Distance Vector
38. In IP header, the purpose of Flag field is
1. To control fragmentation of packets during transmission.
2. To control packet sequencing.
3. To identify the upper layer protocols being used
39.  Do u think ICMP can identify routers on networks.                              Yes/No
40. The ARP maps ________________ addresses to _________________ addresses.
41. The RARP maps _______________ addresses to _________________ addresses.

42. What happen if network loses a TCP/IP packet during transmission.
1. The data is lost and unrecoverable
2. TCP retransmit the packet.
3. The data has to be sent again by application.
43. How UDP packet travels to its destination.
1. Encapsulated in IP packet.                    b. In TCP packet
44. How SMTP Transmit data?
1. By transmitting data directly to the destination node.
2. By transmitting data from node to node until the destination node is reached.
45. Identify valid IP addresses
1. 132.1324.87.175         b. 132.132.87              c. 132.132.87.175

d.   132.132.87.0

46. How many possible class B network addresses do u think there r?
1. 127      b.16384           c. 64                d. 65536
47. DNS divides Internet into _______________________.

HOME    BACK