Test your basic knowledge |

CCNA - 2

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Which IP packet field will prevent endless loops?
Application Layer
It provides interface between applications on either end of the network.
A. application b. services
Time-to-live (TTL)

2. What connectors are commonly associated w/ Cisco's V.35 serial cables?
A. DB 60 b. Winchester 15-pin c. smart serial
The address of the router that the host will use to 'get to the other side'.
It uses support from the lower layers to distinguish between connections to the service.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format

3. 2 features that make switches preferable to hubs
Originate data flow.
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
A. minimizing of collisions b. division into broadcast domains
A physical topology.

4. What is the name of the application layer protocol used for file sharing on Microsoft Networks?
A. decentralized resources b. resource sharing w/o a dedicated server
A. hot keys b. context-sensitive c. command syntax check
SMB
A. non-deterministic b. less overhead c. collisions exist

5. Host1 is in the process of setting up a TCP session with Host2. Host1 sent a SYN message to begin establishment - what happens next?
A. DB 60 b. Winchester 15-pin c. smart serial
A. ethernet utilizes CSMA/CD b. defined as placement of data frames on the media c. DLL protocols define the rules for access to different media
Rollover cable
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1

6. Why is flow control used for TCP data transfer?
When connecting a host to a switch.
A. larger address space b. data types and classes of service c. authentication and encryption
Network address
To prevent the receiver from being overwhelmed by incoming data.

7. What application layer protocol is used to support file transfers between client and server?
Network portion
Create signals that represent the bits in each frame for the media.
2046
FTP

8. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
A. enable mode b. priviledge executive mode
A. Cat5 UTP b. Cat6 UTP
Network Media Control
As the commands are entered.

9. 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. show startup-config b. show running-config
255.255.255.224
A. larger address space b. data types and classes of service c. authentication and encryption
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

10. 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
Supports error detection.
Hub
A. enable mode b. priviledge executive mode

11. How does the application layer on a server process multiple client requests for services?
Signal loss can be experienced.
It uses support from the lower layers to distinguish between connections to the service.
Window Size
Supports error detection.

12. During a TCP session - if packets arrive out of order - what will happen?
IP is not properly installed
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
The packets will be delivered and reassembled at destination.
A. MTA b. SMTP

13. If you have a full-duplex operational network - what can happen?
A random delay helps prevent the stations from experiencing another collision during transmission.
Static
Hosts return to listen-before-transmit mode.
No collisions will occur on this link.

14. In a connectionless system - What is correct?
A. router b. firewall
Destination is not contacted before a packet is sent.
Destination Network Address
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

15. What is a characteristic of a single-mode fiber-optic cable?
Destination Network Address
It uses lasers as the light source.
255.255.255.0
Fiber

16. Intermediary devices used to implement security between networks
A. router b. firewall
The packets will be delivered and reassembled at destination.
A. performance degradation b. security issues c. host identification
Network address

17. 3 protocols that operate in the application layer
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
A. DNS b. SMTP c. POP
A. replace a switch w/ a router b. subnet the new networks
SSH

18. What do end devices do?
To enable a receiving host to forward the data to the appropriate application.
A. it has centralized administration b. security is easier to enforce
It uses lasers as the light source.
Originate data flow.

19. What do you need to use for an initial configuration on a Cisco router?
Originate data flow.
A. application b. services
UTP
Console interface

20. What causes crosstalk within cable pairs when using UTP?
A backbone cable.
Rollover cable
A. servers b. routers c. network printers
The magnetic field around the adjacent pairs of wire.

21. To make a console connection from a comp to a Cisco router - what cable should be used?
Rollover cable
Network portion
Source and Destination IP address
Network

22. What information is added during encapsulation at OSI Layer 3?
Source and Destination IP address
Host2 sends a segment to Host1 with: ACK flag = 1 SYN flag = 1
A. DB 60 b. Winchester 15-pin c. smart serial
255.255.255.224

23. What are 3 properties of contention-based media access for a shared media?
Static
A. non-deterministic b. less overhead c. collisions exist
Any device whose backoff timer expires first.
Source and Destination IP address

24. 3 statements about routes and their use
Signal loss can be experienced.
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
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. netstat -r b. route PRINT

25. What makes fiber preferable to copper for interconnecting buildings?
Host mobility
Destination is not contacted before a packet is sent.
A. minimizing of collisions b. division into broadcast domains
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

26. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
Physical
It does not support encryption.
32 bits
Source Port

27. What is the primary purpose of ARP?
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
Resolve IPv4 addresses to MAC addresses.
A. addressing b. error detection c. frame delimiting

28. 2 most commonly used media types in ethernet networks
A. replace a switch w/ a router b. subnet the new networks
A. copper UTP b. optical fiber
Router(config)# interface FastEthernet 0/1
Network Media Control

29. An admin wants to evaluate all traffic in a network. To ensure that all packets are captured - what network device should be used?
Hub
A. hot keys b. context-sensitive c. command syntax check
Source Port
A. media sharing b. logical topology

30. 3 functions of the upper data link sublayer in the OSI model
UTP
A. netstat -r b. route PRINT
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
RJ-45

31. What info is found in the TCP and UDP header info?
A. private addresses are blocked from public internet by routers b. the ip address 127.0.0.1 is the loopback - directs traffic to itself
172.16.192.160
Source and Destination Ports
Rollover cable

32. What are key considering factors when grouping hosts into common networks?
Supports error detection.
A. show startup-config b. show running-config
A. Cat5 UTP b. Cat6 UTP
A. purpose b. geographic location c. ownership

33. On a ethernet segment - why do hosts that experience a collision use a random delay before attempting to transmit?
Collisions can decrease network performance.
Source and Destination Ports
A. they segment broadcast domains b. they interconnect different network technologies c. each router interface requires a separate network or subnet
A random delay helps prevent the stations from experiencing another collision during transmission.

34. What is the purpose of resource records in DNS?
Transport
A. Physical b. Data Link
Is used by the server to resolve names.
Network portion

35. At which layer of the TCP/IP model does ethernet operate?
Network Access
172.16.192.160
The physical address is added.
A physical topology.

36. What determines the method of media access control?
The magnetic field around the adjacent pairs of wire.
Hosts return to listen-before-transmit mode.
A. purpose b. geographic location c. ownership
A. media sharing b. logical topology

37. In an IPv4 environment - what information is used by the router to forward data packets from one interface of a router to another?
Destination Network Address
Network Layer
80 (HTTP)
A physical topology.

38. What is a disadvantage of Telnet?
0 to 1023
It does not support encryption.
Destination Network Address
Network Layer Packet

39. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
IP is not properly installed
A. HTTP b. HTTPS
A. goodput b. throughput c. bandwidth
A. enable mode b. priviledge executive mode

40. What is the primary function of encapsulating packets into frames?
FTP
A random delay helps prevent the stations from experiencing another collision during transmission.
Rollover cable
To facilitate the entry and exit of data on media.

41. Which characteristics describe fiber optic cable?
Destination Network Address
They must wait until the first hosts finish transfering the media.
A. not affected by EMI of RFI b. most expensive type of LAN cabling
A. MTA b. SMTP

42. What is the purpose of the preamble in an ethernet frame?
A. netstat -r b. route PRINT
It reduces unnecessary broadcasts.
The address of the router that the host will use to 'get to the other side'.
It is used for timing synchronization w/ alternating patterns of 1s and 0s.

43. 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
A. media sharing b. logical topology
To facilitate the entry and exit of data on media.
A. determine pathways for data b. retrieve and retransmit data signals c. manage data flows

44. Which device is used to create or divide broadcast domains?
Router
A backbone cable.
Network portion
A. router b. firewall

45. What is the primary purpose of Layer 4?
A. non-deterministic b. less overhead c. collisions exist
Identify processes or services that are communicating with end devices.
A random delay helps prevent the stations from experiencing another collision during transmission.
Any device whose backoff timer expires first.

46. What are 2 commands used to view a host routing table?
A. netstat -r b. route PRINT
The MAC protocol can be very simple.
Time-to-live (TTL)
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential

47. What is the purpose of the TCP/IP Network Application Layer?
A. Physical b. Data Link
When connecting a host to a switch.
Network Media Control
Console interface

48. What is the primary funcion of the trailer in the Data Link Layer encapsulation?
A. located in a single geographical area b. administered by a single organization c. each end is connected to a Telecommunication Service Provider (TSP)
Supports error detection.
Console interface
A. physical layer b. DLL layer

49. What layer encapsulates segments into packets?
It uses support from the lower layers to distinguish between connections to the service.
Network Layer
Binary ANDing
It is used for timing synchronization w/ alternating patterns of 1s and 0s.

50. 3 characteristics of valid Ethernet Layer 2 addresses
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
A. router b. firewall
A. Cat5 UTP b. Cat6 UTP
Network portion