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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. What are three key factors to consider when grouping hosts into a common network?
Connectionless
128
Purpose - ownership - and geographic location are key ways to divide a network
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

2. Which protocol ensures more reliable delivery between applications - TCP or UDP?
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.
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
TFTP - Trivial File Transfer Protocol
TCP. It makes larger demands on a network

3. Dynamic ports fall into what category of port
Routing table
Ephermeral
Data link - physical
The default gateway address is the address of a router interface that is connected to the same network as the host.

4. Pieces of information about a route that a routing table contains
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

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

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6. What four tasks does the network layer perform?
It works the same on all Layer 1 media
RIP (Routing Information Protocol)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Data link - physical

7. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
TCP
Gateway
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

8. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
UDP - it sends datagrams as 'best effort'
53
Not - these are done by other protocols in other layers
1

9. Which is a connection-oriented protocol - TCP or UDP?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP
Upper

10. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Synchronize sequence numbers
IRC
Window size
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

11. Which of the following are true about static and dynamic routing?
Telnet
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
All
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

12. 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?
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.
53
Web browsing - email - file transfer
Static routing

13. The three-way handshake performs what three functions?
Netstat -r and route print
UDP
HTTPS (Secure HTTP)
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

14. Port 8080 is?
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
An alternate HTTP port
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It is the most common - and it encapsulates transport layer segments

15. Port 520 is?
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
DNS - video-streaming - VoIP
RIP (Routing Information Protocol)

16. MTU stands for ?
Not - these are done by other protocols in other layers
Maximum transmission unit
Transport
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

17. Are well known ports registered
An alternate HTTP port
The source and destination port number
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
User Datagram Protocol

18. ACK is?
Acknowledgment field significant
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.
HTTPS (Secure HTTP)
TCP uses flow control

19. How many bits are in an IPv6 address?
128
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
RIP (Routing Information Protocol)
Dynamic / private

20. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
Reliable - connection-oriented protocol (resends if not received)
53
FIN
All

21. 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
Does not
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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

22. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
UDP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Packet

23. List three network applications that use TCP
POP3
TFTP - Trivial File Transfer Protocol
Web browsing - email - file transfer
Routers (the subnetting process)

24. UDP stands for?
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.
TCP
Decapsulation
User Datagram Protocol

25. What are the transport layer's responsibilities?
Destination network - next-hop - metric
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
Routers (the subnetting process)
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

26. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
UDP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Routers (the subnetting process)

27. Encapsulation occurs at all - some or none of the layers of the OSI model?
Not - these are done by other protocols in other layers
FIN
All
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.

28. What does segmentation provide to communications?
TCP. It makes larger demands on a network
Connectionless - Best effort (unreliable) - media independent
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.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

29. Port 443 is?
HTTPS (Secure HTTP)
FTP
UDP - it sends datagrams as 'best effort'
32 - there are four octets of 8 bits each in an IPv4 address

30. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
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.
The source and destination port number

31. Name the private address blocks
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
Telnet
Allows the transport layer function on the destination host to reassemble segments in the right order
DNS - video-streaming - VoIP

32. 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
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Connectionless - Best effort (unreliable) - media independent

33. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
All
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets

34. What is the default DNS port number?
53
Transport
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.
Ephermeral

35. Which is a connectionless protocol - UDP or TCP?
Connectionless
FTP
UDP
TCP uses flow control

36. Why is IP 'media independent'?
Connectionless - Best effort (unreliable) - media independent
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
HTTPS (Secure HTTP)
It works the same on all Layer 1 media

37. Port 194 is?
Purpose - ownership - and geographic location are key ways to divide a network
IRC
128
Gateway

38. On a particular network how would you determine the default gateway address for a host?
An alternate HTTP port
The default gateway address is the address of a router interface that is connected to the same network as the host.
Synchronize sequence numbers
Acknowledgment field significant

39. List three network applications that use UDP
Upper
TCP
Static routing
DNS - video-streaming - VoIP

40. What is the proper order of SYN sequence?
Decapsulation
SMTP
128
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

41. 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.
TCP uses flow control
TCP
Synchronize sequence numbers
Data link - physical

42. What two commands can be used to view a host's routing table?
Netstat -r and route print
Routing table
An alternate HTTP port
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

43. What is the port range for dynamic or private ports
Netstat -r and route print
HTTPS (Secure HTTP)
49152 - 65535.
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

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

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45. Which of the following are not functions of the network layer?
Unique
128
Netstat -r and route print
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

46. TCP header provides for
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
1
Routers (the subnetting process)

47. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

48. 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
TCP
Purpose - ownership - and geographic location are key ways to divide a network
Dynamic / private

49. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
IRC
Purpose - ownership - and geographic location are key ways to divide a network
Web browsing - email - file transfer

50. What is contained in the header of each segment or datagram?
Data link - physical
53
The source and destination port number
Connectionless