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CCNA - 2

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What can you identify when you examine the Network Layer header?
Network
A. low overhead b. connectionless
The destination host address.
A. hot keys b. context-sensitive c. command syntax check

2. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
Window Size
Resolve IPv4 addresses to MAC addresses.
A backbone cable.
To facilitate the entry and exit of data on media.

3. What is PDU?
Is a layer of specific encapsulation.
A default gateway (router).
A. application b. services
As the commands are entered.

4. Which layer supplies services and allows user interface?
Application Layer
A. DNS b. SMTP c. POP
Identify processes or services that are communicating with end devices.
Hosts return to listen-before-transmit mode.

5. In a connectionless system - What is correct?
Logical Link Control sublayer
Destination is not contacted before a packet is sent.
A. identifies the communicating applications b. identifies multiple conversations between the hosts
It uses support from the lower layers to distinguish between connections to the service.

6. What is a characteristic of a logical point-to-point topology?
A. MTA b. SMTP
A. replace a switch w/ a router b. subnet the new networks
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info
The MAC protocol can be very simple.

7. What is the purpose of resource records in DNS?
A. they initiate data exchanges b. they may upload data to servers
It provides for the exchange of data over a common local media.
255.255.255.224
Is used by the server to resolve names.

8. What are key considering factors when grouping hosts into common networks?
To enable a receiving host to forward the data to the appropriate application.
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A default gateway (router).
A. purpose b. geographic location c. ownership

9. What is the primary function of encapsulating packets into frames?
A. identifies pieces of data as part of the same communication b. ensures the data pieces can be directed to the correct receiving end device
To facilitate the entry and exit of data on media.
Is a layer of specific encapsulation.
Is used by the server to resolve names.

10. Which portion of the network layer address does a router use to forward packets?
Network portion
A. next-hop b. metric/interface c. destination network address
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet

11. 3 properties of peer-2-peer applications
A. perform degradation b. security issues c. host identification
SMB
A. acts as both client and server w/ same communication b. hybrid mode includes a centralized directory of files c. can be used in client-server networks
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations

12. Statements that describe LAN
Switch
Identify the device that allows local network computers to communicate w/ devices in other networks.
A. it has centralized administration b. security is easier to enforce
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)

13. After an ethernet collision - which device has priority to transmit data?
To prevent the receiver from being overwhelmed by incoming data.
The destination host address.
Any device whose backoff timer expires first.
A. Physical b. Data Link

14. After a routers ends its boot sequence - the admin wants to check the routers config. From the EXEC mode - which commands can the admin use?
A. copied into RAM during system startup b. contains a 3 byte OUI c. is 6 bytes long
Network Access
A. low overhead b. connectionless
A. show startup-config b. show running-config

15. 2 things that will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away
A. the router will discard the packet b. the router will send a time exceeded message to the source host
Switch
Any device whose backoff timer expires first.
Twisting of the cables

16. What is the role of the OSI Application Layer?
The physical address is added.
Console interface
It provides interface between applications on either end of the network.
To enable a receiving host to forward the data to the appropriate application.

17. At which layer of the TCP/IP model does ethernet operate?
To facilitate the entry and exit of data on media.
A. replace a switch w/ a router b. subnet the new networks
A physical topology.
Network Access

18. There are too many broadcasts on switches - what can be done?
A. copper UTP b. optical fiber
A. replace a switch w/ a router b. subnet the new networks
Is used by the server to resolve names.
A. media sharing b. logical topology

19. What is a protocol that provides connectionless network layer services?
Physical
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
IP Protocol
Router

20. Which type of cable is most often associated w/ fiber-optic cable?
A backbone cable.
A default gateway (router).
Rollover cable
It has expanded adressing capabilities.

21. What is the function of the DLL?
A. they initiate data exchanges b. they may upload data to servers
It provides for the exchange of data over a common local media.
A. security is difficult to enforce b. if one of the computers is responding to file sharing requests - that computer is functioning as a server
UDP

22. 3 facts about the network portion of an IPv4 address
A. they initiate data exchanges b. they may upload data to servers
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions
A. show startup-config b. show running-config
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet

23. Which transport layer protocol provides low overhead and is used for applications that do not require reliable data delivery?
To facilitate the entry and exit of data on media.
UDP
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
Host mobility

24. If host A's DG is 10.0.0.1 and host B's DG is 10.0.0.2 - when the router's IP address is 10.0.0.1. Which one will go through?
A. DNS b. SMTP c. POP
Host A
Ctrl + Shift + 6
A. the device will still operate at the same Layer 2 address (the address it had before) b. Layer 3 address must me reassigned for it to communicate w/ the network

25. What is a disadvantage of Telnet?
Router
To enable a receiving host to forward the data to the appropriate application.
It does not support encryption.
A. larger address space b. data types and classes of service c. authentication and encryption

26. What do the intermediary devices in the network do?
Fiber
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. replace a switch w/ a router b. subnet the new networks
It has expanded adressing capabilities.

27. What method of signal transmission uses radio waves to carry signals?
A. decentralized resources b. resource sharing w/o a dedicated server
RJ-45
The magnetic field around the adjacent pairs of wire.
Wireless

28. What characteristic of an UTP helps reduce interference?
Application Layer
Twisting of the cables
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
When connecting a host to a switch.

29. There are 4 different hosts connected to a hub - media is being transfered between 2 of them but the other 2 will also like to transfer media. What must the latest hosts do to transfer the media?
Network
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
They must wait until the first hosts finish transfering the media.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

30. If you have a PC - 3 routers and a Laptop... How many unique CRC calculation will take place as traffic routes from the PC to the Laptop?
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Minimal delays in data delivery.
8
Identify processes or services that are communicating with end devices.

31. What networking devices are recommended to be assigned static IP addresses?
A. HTTP b. HTTPS
A. servers b. routers c. network printers
Host A
A. next-hop b. metric/interface c. destination network address

32. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
Supports error detection.
A. copper UTP b. optical fiber
Source Port
Network address

33. What determines the method of media access control?
Twisting of the cables
A. the router will discard the packet b. the router will send a time exceeded message to the source host
It does not support encryption.
A. media sharing b. logical topology

34. When destination network is not in the routing table - What are 2 actions the router might take?
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
Host uses a default route to transfer data to host outside the local network when no other route to the destination exists.
The magnetic field around the adjacent pairs of wire.
80 (HTTP)

35. After a browser makes a request to a web server in the standard port - what will be the port number in the TCP header?
A. MTA b. SMTP
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
Originate data flow.
80 (HTTP)

36. With TCP/IP encapsulation - which range of port numbers identifies all well known applications?
0 to 1023
Network portion
A. performance degradation b. security issues c. host identification
Hub

37. What is the primary reason for developing IPv6?
A. DNS b. SMTP c. POP
A. media sharing b. logical topology
It has expanded adressing capabilities.
A. larger address space b. data types and classes of service c. authentication and encryption

38. 2 characteristics of clients in data networks
A. media sharing b. logical topology
DNS
A. they initiate data exchanges b. they may upload data to servers
A default gateway (router).

39. What do end devices do?
Rollover cable
To prevent the receiver from being overwhelmed by incoming data.
255.255.255.0
Originate data flow.

40. Which IP packet field will prevent endless loops?
Identify the device that allows local network computers to communicate w/ devices in other networks.
IP Protocol
It uses lasers as the light source.
Time-to-live (TTL)

41. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
Hosts return to listen-before-transmit mode.
Host A
A. HTTP b. HTTPS
A. if destination network is directly connected - router forwards packet to destination host b. if no route exists for the destination and the default route is present - packet if fowarded to the next-hop c. if the originating host has a default gate

42. What are 2 email components used to forward mail between servers?
A. MTA b. SMTP
80 (HTTP)
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
A. identifies the communicating applications b. identifies multiple conversations between the hosts

43. Which characteristics describe fiber optic cable?
A. they initiate data exchanges b. they may upload data to servers
Router(config)# hostname Costas
Transport
A. not affected by EMI of RFI b. most expensive type of LAN cabling

44. What is the purpose of the preamble in an ethernet frame?
172.16.192.160
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Create signals that represent the bits in each frame for the media.
Fiber

45. To make a console connection from a comp to a Cisco router - what cable should be used?
Destination Network Address
A. security is difficult to enforce b. if one of the computers is responding to file sharing requests - that computer is functioning as a server
Rollover cable
A. purpose b. geographic location c. ownership

46. What is the purpose of a default gateway?
A. DB 60 b. Winchester 15-pin c. smart serial
Identify the device that allows local network computers to communicate w/ devices in other networks.
Console
IP is not properly installed

47. What can get you to an outside network?
A. copper UTP b. optical fiber
A. Cat5 UTP b. Cat6 UTP
A. goodput b. throughput c. bandwidth
A default gateway (router).

48. When is a straight-through cable used in a network?
Static
DNS
255.255.255.224
When connecting a host to a switch.

49. What subnet mask will an admin assign to the network address 172.30.1.0 if its possible to have 254 hosts?
255.255.255.0
A. copper UTP b. optical fiber
OTDR
A. minimizing of collisions b. division into broadcast domains

50. A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
Host A
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
172.16.192.160

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CCNA - 2

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