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

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2. TCP header provides for
Does not
False. It's like a file - only one process can read/write.
POP3
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

3. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
The default gateway address is the address of a router interface that is connected to the same network as the host.
TCP uses flow control
Web browsing - email - file transfer

4. MSN messenger uses TCP or UDP?
POP3
Packet
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

5. What is the netstat utility used for on a host?
49152 - 65535.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Purpose - ownership - and geographic location are key ways to divide a network
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

6. What are the three basic characteristics of IPv4?
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
Connectionless - Best effort (unreliable) - media independent
53
POP3

7. List three network applications that use UDP
DNS - video-streaming - VoIP
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
Upper
Window size

8. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Destination network - next-hop - metric
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Allows the transport layer function on the destination host to reassemble segments in the right order

9. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
Ephermeral
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
Data link - physical
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

10. During data transfer - What is the receiving host responsible 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
It is the most common - and it encapsulates transport layer segments
TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

11. What is the protocol number for UDP?
FIN
Data link - physical
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use

12. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Synchronize sequence numbers
FIN
HTTPS (Secure HTTP)
Decapsulation

13. Port 520 is?
Transport
UDP - it sends datagrams as 'best effort'
Does not
RIP (Routing Information Protocol)

14. Port 110 is?
Connectionless
TFTP - Trivial File Transfer Protocol
Routers (the subnetting process)
POP3

15. IP requires that each sending and receiving device have a __________ IP address.
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
Unique
Not - these are done by other protocols in other layers
TFTP - Trivial File Transfer Protocol

16. Encapsulation occurs at all - some or none of the layers of the OSI model?
TFTP - Trivial File Transfer Protocol
All
49152 - 65535.
Static routing

17. Are well known ports registered
Ephermeral
SMTP
Connectionless - Best effort (unreliable) - media independent
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

18. What is a broadcast domain?
Synchronize sequence numbers
Packet
49152 - 65535.
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use

19. What is the port range for well known 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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
TFTP - Trivial File Transfer 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.

20. What is the purpose of TCP/UDP port numbers?
Upper
Synchronize sequence numbers
To track the different conversations crossing the network at the same time
Reliable - connection-oriented protocol (resends if not received)

21. How does UDP keep track of sequence numbers?

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22. ACK is?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Acknowledgment field significant
Not - these are done by other protocols in other layers
POP3

23. What is the default DNS port number?
53
It Doesn't - TCP does
Telnet
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.

24. Why is IP 'media independent'?
Data link - physical
It works the same on all Layer 1 media
53
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

25. What is the port range for Registered ports
The source and destination port number
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
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Reliable - connection-oriented protocol (resends if not received)

26. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
49152 - 65535.
TFTP - Trivial File Transfer Protocol
53
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

27. Routers add routes for the connected networks to their ________________ .
POP3
FIN
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
Routing table

28. Which is a connection-oriented protocol - TCP or UDP?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
20 and 8
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP

29. What two commands can be used to view a host's routing table?
Upper
TCP. It makes larger demands on a network
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
Netstat -r and route print

30. What is the purpose of the ToS field in the IPv4 header?
To track the different conversations crossing the network at the same time
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.
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
TCP uses flow control

31. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Maximum transmission unit
Ephermeral
HTTPS (Secure HTTP)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

32. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
IRC
It is the most common - and it encapsulates transport layer segments
Decapsulation

33. Ports can be shared at the same time? (t/f)

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34. What information does a router need to successfully forward packets?
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
TCP. It makes larger demands on a network
Routers (the subnetting process)
49152 - 65535.

35. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
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
Static routing
Allows the transport layer function on the destination host to reassemble segments in the right order
Acknowledgment field significant

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

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37. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It works the same on all Layer 1 media
SMTP
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

38. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Acknowledgment field significant
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Window size
Transport

39. Port 23 is?
Telnet
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Packet

40. Dynamic ports fall into what category of port
All
Packet
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Ephermeral

41. What is the purpose of sequence numbers?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
It is the most common - and it encapsulates transport layer segments
Allows the transport layer function on the destination host to reassemble segments in the right order

42. SYN is?
Synchronize sequence numbers
FIN
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
Not - these are done by other protocols in other layers

43. Name the private address blocks
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255
Netstat -r and route print

44. IP is designed or not designed to track and manage the flow of packets?
Routing table
POP3
All
Not - these are done by other protocols in other layers

45. TCP is a ________________ layer protocol.
TCP
IRC
Data link - physical
Transport

46. List three network applications that use TCP
Web browsing - email - file transfer
Telnet
32 - there are four octets of 8 bits each in an IPv4 address
Routers (the subnetting process)

47. In networking terms - What is reliability?
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
It means ensuring that each segment that the source sends arrives at the destination
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Maximum transmission unit

48. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Does not
TCP
Destination network - next-hop - metric
TCP. It makes larger demands on a network

49. How many bytes of overhead do TCP segments carry? How many does UDP carry?
It is the most common - and it encapsulates transport layer segments
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
20 and 8
Web browsing - email - file transfer

50. What are the transport layer's responsibilities?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
False. It's like a file - only one process can read/write.
Connectionless - Best effort (unreliable) - media independent
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