Test your basic knowledge |

Cisco Network Fundamentals - 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. Encapsulation occurs at all - some or none of the layers of the OSI model?
20 and 8
49152 - 65535.
Ephermeral
All

2. What is the netstat utility used for on a host?
49152 - 65535.
Does not
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
False. It's like a file - only one process can read/write.

3. What is the port range for Registered ports
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
POP3
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction

4. Are well known ports registered
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reliable - connection-oriented protocol (resends if not received)
Web browsing - email - file transfer

5. What is the port range for dynamic or private ports
49152 - 65535.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Acknowledgment field significant
Web browsing - email - file transfer

6. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Gateway
Reliable - connection-oriented protocol (resends if not received)
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th

7. Ephermeral port is what type of port
Transport
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
Dynamic / private
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

8. Which is a connection-oriented protocol - TCP or UDP?
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
TCP
Acknowledgment field significant
The source and destination port number

9. Which of the following are true about TCP and IP?

10. Which of the following are true about static and dynamic routing?
Not - these are done by other protocols in other layers
Reliable - connection-oriented protocol (resends if not received)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

11. IP is designed or not designed to track and manage the flow of packets?
Connectionless - Best effort (unreliable) - media independent
Ephermeral
Not - these are done by other protocols in other layers
Web browsing - email - file transfer

12. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
POP3
Window size
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

13. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Routing table

14. Why does TCP use a sequence number in the header?
1
Transport
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p

15. IP requires that each sending and receiving device have a __________ IP address.
Unique
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Allows the transport layer function on the destination host to reassemble segments in the right order
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

16. What is the purpose of TCP/UDP port numbers?
Netstat -r and route print
UDP - it sends datagrams as 'best effort'
To track the different conversations crossing the network at the same time
The default gateway address is the address of a router interface that is connected to the same network as the host.

17. Port 110 is?
HTTPS (Secure HTTP)
53
POP3
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

18. Port 25 is?
SMTP
Allows the transport layer function on the destination host to reassemble segments in the right order
Decapsulation
DNS - video-streaming - VoIP

19. Dynamic ports fall into what category of port
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent
Ephermeral
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

20. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
UDP - it sends datagrams as 'best effort'
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.

21. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
FIN
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
Maximum transmission unit
Upper

22. Port 443 is?
HTTPS (Secure HTTP)
TCP
IRC
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer

23. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
RIP (Routing Information Protocol)
Connectionless
Packet
The default gateway address is the address of a router interface that is connected to the same network as the host.

24. SYN is?
Allows the transport layer function on the destination host to reassemble segments in the right order
Not - these are done by other protocols in other layers
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Synchronize sequence numbers

25. What two commands can be used to view a host's routing table?
TCP uses flow control
49152 - 65535.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Netstat -r and route print

26. Which of the following is true about IP?

27. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?

28. What is contained in the header of each segment or datagram?
32 - there are four octets of 8 bits each in an IPv4 address
SMTP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
The source and destination port number

29. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Dynamic / private
Not - these are done by other protocols in other layers
Reliable - connection-oriented protocol (resends if not received)

30. The three-way handshake performs what three functions?
Window size
User Datagram Protocol
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port

31. Pieces of information about a route that a routing table contains
Decapsulation
Data link - physical
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
It Doesn't - TCP does

32. What does segmentation provide to communications?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
The default gateway address is the address of a router interface that is connected to the same network as the host.

33. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
Acknowledgment and reassembly (receipt of packets and putting them in right order)
UDP
TCP

34. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Unique
Reliable - connection-oriented protocol (resends if not received)
Maximum transmission unit
Routers (the subnetting process)

35. Which is a connectionless protocol - UDP or TCP?
Not - these are done by other protocols in other layers
Upper
UDP
UDP - it sends datagrams as 'best effort'

36. Port 69 is?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
20 and 8
TFTP - Trivial File Transfer Protocol
The source and destination port number

37. UDP stands for?
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
Telnet
32 - there are four octets of 8 bits each in an IPv4 address
User Datagram Protocol

38. The three main features of routes in a routing table are?
Destination network - next-hop - metric
Data link - physical
RIP (Routing Information Protocol)
Telnet

39. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
32 - there are four octets of 8 bits each in an IPv4 address
Destination network - next-hop - metric
The source and destination port number

40. Which of the following are true about IP?
An alternate HTTP port
It is the most common - and it encapsulates transport layer segments
Not - these are done by other protocols in other layers
Purpose - ownership - and geographic location are key ways to divide a network

41. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
False. It's like a file - only one process can read/write.
It means ensuring that each segment that the source sends arrives at the destination
Data link - physical

42. List three network applications that use UDP
Connectionless
TCP uses flow control
It works the same on all Layer 1 media
DNS - video-streaming - VoIP

43. What are the transport layer's responsibilities?
49152 - 65535.
Static routing
Does not
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da

44. What are three key factors to consider when grouping hosts into a common network?
Data link - physical
Acknowledgment field significant
Purpose - ownership - and geographic location are key ways to divide a network
User Datagram Protocol

45. MSN messenger uses TCP or UDP?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
128
TCP
User Datagram Protocol

46. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Web browsing - email - file transfer
TCP uses flow control
UDP - it sends datagrams as 'best effort'
IRC

47. Port 194 is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
IRC
SMTP
Unique

48. Port 20 is?
Netstat -r and route print
TFTP - Trivial File Transfer Protocol
Not - these are done by other protocols in other layers
FTP

49. What is the proper order of FIN sequence?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
All
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

50. Port 23 is?
Transport
Telnet
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
To track the different conversations crossing the network at the same time