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CCNA - 2

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. What is a drawback of the CSMA/CD access method?
A. application b. services
Resolve IPv4 addresses to MAC addresses.
Collisions can decrease network performance.
0 to 1023

2. 2 common methods for settin a UTP ethernet port to MDI or MDIX?
A. automatic detection and negotiating of MDI/MDIX operation of the port b. enabling the mechanism to electrically swap the transmit and receive pairs
A. show startup-config b. show running-config
Router
A. HTTP b. HTTPS

3. What does the IEEE 802.2 standard represent in Ethernet technologies?
Console interface
A. non-deterministic b. less overhead c. collisions exist
Logical Link Control sublayer
Host mobility

4. Which characteristics describe fiber optic cable?
A. not affected by EMI of RFI b. most expensive type of LAN cabling
When connecting a host to a switch.
A. Physical b. Data Link
A. addressing b. error detection c. frame delimiting

5. What is the primary function of encapsulating packets into frames?
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
A. application b. services
To facilitate the entry and exit of data on media.
Transport

6. Which IP packet field will prevent endless loops?
Time-to-live (TTL)
A default gateway (router).
Logical Link Control sublayer
UDP

7. Which device is used to create or divide broadcast domains?
Router
Time-to-live (TTL)
UDP
Binary ANDing

8. 3 statements of media acess control
A. MTA b. SMTP
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
A. servers b. routers c. network printers
8

9. What would be the response displayed after pinging 127.0.0.1 and there is a 0 packet transmission?
A. Cat5 UTP b. Cat6 UTP
A. media sharing b. logical topology
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
IP is not properly installed

10. During encapsulation - what happens in the Data Link Layer?
A. media sharing b. logical topology
Hosts return to listen-before-transmit mode.
Network address
The physical address is added.

11. When is a straight-through cable used in a network?
When connecting a host to a switch.
It uses lasers as the light source.
A. enable mode b. priviledge executive mode
A default gateway (router).

12. What are 2 commands used to view a host routing table?
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Application Layer
Window Size
A. netstat -r b. route PRINT

13. Important characteristic of UDP
Application Layer
Is used by the server to resolve names.
Minimal delays in data delivery.
8

14. Where is the IOS file stored at?
Flash
2046
No collisions will occur on this link.
255.255.255.224

15. 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?
Next-Hop Address
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
Host A
Flash

16. When destination network is not in the routing table - What are 2 actions the router might take?
RJ-45
A. router discards the packet b. router forwards the packet out the interface indicated in the route entry
A. perform degradation b. security issues c. host identification
A. next-hop b. metric/interface c. destination network address

17. statements of IP adressing
Is used by the server to resolve names.
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
A. perform degradation b. security issues c. host identification
A. MTA b. SMTP

18. What is a disadvantage of Telnet?
Destination is not contacted before a packet is sent.
Minimal delays in data delivery.
Network
It does not support encryption.

19. If there are potential electrical and/or electromagnetic hazards - what type of media is recommended for backbone cabling?
Signal loss can be experienced.
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
Flash
Fiber

20. What command will you use to place the router into the correct mode to configure an appropiate interface to connect a LAN?
A. performance degradation b. security issues c. host identification
A. identifies network layer protocol b. makes the connection w/ the upper layers c. insulates network layer protocols from changes in physical equipment
Router
Router(config)# interface FastEthernet 0/1

21. What are 3 pieces of info about a route contained in a routing table?
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
A. next-hop b. metric/interface c. destination network address
Rollover cable
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet

22. How many host addresses can be assigned to a subnetwork when using the 130.68.0.0 network address w/ a subnet mask of 255.255.248.0?
A. minimizing of collisions b. division into broadcast domains
It uses lasers as the light source.
2046
Source and Destination IP address

23. What are 3 properties of contention-based media access for a shared media?
Time-to-live (TTL)
A. non-deterministic b. less overhead c. collisions exist
A. physical layer b. DLL layer
A. consumes network bandwidth b. increases overhead on network c. interrupts other host functions

24. 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?
Host mobility
A. show startup-config b. show running-config
Show Interfaces
A. minimizing of collisions b. division into broadcast domains

25. What is a characteristic of a single-mode fiber-optic cable?
Wireless
A. MTA b. SMTP
32 bits
It uses lasers as the light source.

26. Which OSI model layer is responsible for regulating the flow of information from source to destination - reliably and accurately?
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
Transport
As the commands are entered.
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

27. After an ethernet collision - which device has priority to transmit data?
A. Physical b. Data Link
A. DNS b. SMTP c. POP
Any device whose backoff timer expires first.
Ctrl + Shift + 6

28. Why are port numbers included in the TCP header of a segment?
0 to 1023
Network address
IP Protocol
To enable a receiving host to forward the data to the appropriate application.

29. What do you need to use for an initial configuration on a Cisco router?
Create signals that represent the bits in each frame for the media.
Console interface
Rollover cable
It reduces unnecessary broadcasts.

30. Why is flow control used for TCP data transfer?
Ctrl + Shift + 6
To prevent the receiver from being overwhelmed by incoming data.
A. 48 binary bits in length b. physical addresses c. represented in a hexadecimal format
Switch

31. An admin needs to keep contents private - which access method should he use?
SSH
A. minimizing of collisions b. division into broadcast domains
A. DB 60 b. Winchester 15-pin c. smart serial
It uses lasers as the light source.

32. What networking devices are recommended to be assigned static IP addresses?
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. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. DNS b. SMTP c. POP
A. servers b. routers c. network printers

33. Network Protocols
A. define structure of layer specific PDUs b. outline the functions necessary for communication between layers c. require layer dependent capsulations
A. not affected by EMI of RFI b. most expensive type of LAN cabling
To enable a receiving host to forward the data to the appropriate application.
A. goodput b. throughput c. bandwidth

34. 2 functions of encapsulation
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. goodput b. throughput c. bandwidth
Transport
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

35. What statements describe the logical token-passing topology?
When connecting a host to a switch.
A. computers are allowed to transmit data only when they posses a token b. electronic tokens are passes sequentially to each other
It uses lasers as the light source.
A backbone cable.

36. If there is a graphic representation of a company network wiring and equipment - What is this called?
To enable a receiving host to forward the data to the appropriate application.
UDP
Network Access
A physical topology.

37. With TCP/IP encapsulation - which range of port numbers identifies all well known applications?
255.255.255.0
0 to 1023
A backbone cable.
Ctrl + Shift + 6

38. 3 factors that should be considered when implementing Layer 2 protocols
A. geographic scope of the network b. physical layer implementation c. number of hosts to be interconnected
A default gateway (router).
SSH
Router(config)# hostname Costas

39. In business LANs - which connector is used w/ twisted-pair networking cable?
RJ-45
A. HTTP b. HTTPS
A. is identical for all hosts in a broadcast domain b. varies in length c. is used to forward packet
As the commands are entered.

40. What are 2 forms of application layer software?
A. performance degradation b. security issues c. host identification
Network address
A. application b. services
DNS

41. 3 statements about routes and their use
A default gateway (router).
They must wait until the first hosts finish transfering the media.
UDP
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. During a TCP session - if packets arrive out of order - what will happen?
A. HTTP b. HTTPS
Console
The packets will be delivered and reassembled at destination.
A. flow control b. session establishment c. numbering and sequencing

43. When a collision occurs using CSMA/CD - how do hosts w/ data to transmit respond after the backoff period expires?
A. greater distances per cable run b. limited susceptibility to EMI/RFI c. greater bandwidth potential
The physical address is added.
80 (HTTP)
Hosts return to listen-before-transmit mode.

44. What event occurs during the 3-way handshake?
TCP initializes the sequence numbers for the sessions.
UTP
A. flow control b. session establishment c. numbering and sequencing
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

45. What is a mechanism used by TCP to provide flow control as segments travel from source to destination?
Network portion
Window Size
It provides interface between applications on either end of the network.
32 bits

46. An admin needs a media that can run up to 100m in legth. Which type of media would be best?
The physical address is added.
Is a layer of specific encapsulation.
UTP
A. provide routers w/ up-to-date routing tables b. consume bandwidth to exchange route info

47. What command can be used to determine if the router has experienced any input or output errors?
Show Interfaces
Binary ANDing
A. application b. services
A. flow control b. session establishment c. numbering and sequencing

48. Which OSI layer is responsible for binary transmission - cable specification - and physical aspects of network communication?
IP Protocol
Physical
A. Physical b. Data Link
255.255.255.224

49. If the router says: 'Switch-East4#' What identifies the CLI mode represented?
It is used for timing synchronization w/ alternating patterns of 1s and 0s.
The MAC protocol can be very simple.
The host can communicate w/ other hosts in the local network but is unable to communicate w/ hosts on the other networks.
A. enable mode b. priviledge executive mode

50. What is the primary purpose of ARP?
A. MTA b. SMTP
A. Physical b. Data Link
Resolve IPv4 addresses to MAC addresses.
Network Layer

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CCNA - 2

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