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Cisco Network Fundamentals - 2

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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. Port 110 is?
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.
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
Does not
POP3

2. What is a broadcast domain?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
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
FTP

3. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Connectionless - Best effort (unreliable) - media independent
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
Reliable - connection-oriented protocol (resends if not received)

4. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Allows the transport layer function on the destination host to reassemble segments in the right order
An alternate HTTP port
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
20 and 8

5. Dynamic ports fall into what category of port
Ephermeral
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

6. 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)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
To track the different conversations crossing the network at the same time
Connectionless

7. Which of the following are true about static and dynamic routing?
UDP - it sends datagrams as 'best effort'
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Reliable - connection-oriented protocol (resends if not received)

8. Why does TCP use a sequence number in the header?
Static routing
32 - there are four octets of 8 bits each in an IPv4 address
Allows the transport layer function on the destination host to reassemble segments in the right order
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

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

10. What are the transport layer's responsibilities?
Not - these are done by other protocols in other layers
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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. Pieces of information about a route that a routing table contains
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Routing table
49152 - 65535.
FTP

12. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
IRC
Web browsing - email - file transfer
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
Routers (the subnetting process)

13. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
TCP. It makes larger demands on a network
The source and destination port number
Window size
Connectionless

14. What four tasks does the network layer perform?
Dynamic / private
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Netstat -r and route print
IRC

15. Ephermeral port is what type of port
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
User Datagram Protocol
An alternate HTTP port
Dynamic / private

16. IP is designed or not designed to track and manage the flow of packets?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It means ensuring that each segment that the source sends arrives at the destination
Not - these are done by other protocols in other layers
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

17. What is the default DNS port number?
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
53
Not - these are done by other protocols in other layers

18. UDP does or does not create a session?
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
Routing table
Does not
Web browsing - email - file transfer

19. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
Static routing
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

20. 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
Acknowledgment field significant
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 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

21. The three main features of routes in a routing table are?
Unique
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.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Destination network - next-hop - metric

22. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Packet
20 and 8

23. What is the port range for dynamic or private ports
Ephermeral
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
49152 - 65535.

24. MTU stands for ?
Maximum transmission unit
Not - these are done by other protocols in other layers
FIN
Data link - physical

25. Which of the following are true about network layer encapsulation?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Ephermeral
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.
UDP - it sends datagrams as 'best effort'

26. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Connectionless
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
Destination network - next-hop - metric

27. List three network applications that use TCP
Web browsing - email - file transfer
The default gateway address is the address of a router interface that is connected to the same network as the host.
Maximum transmission unit
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

28. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
UDP - it sends datagrams as 'best effort'
Packet
TCP uses flow control
Reliable - connection-oriented protocol (resends if not received)

29. SYN is?
POP3
An alternate HTTP port
Synchronize sequence numbers
Does not

30. ACK is?
Acknowledgment field significant
Reliable - connection-oriented protocol (resends if not received)
Connectionless - Best effort (unreliable) - media independent
DNS - video-streaming - VoIP

31. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
User Datagram Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.
Packet

32. Port 23 is?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Telnet
Web browsing - email - file transfer
Forward the packet to the default route interface (gateway) or just drop/discard the packets

33. What is the port range for Registered ports
Acknowledgment field significant
IRC
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.

34. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Window size
It means ensuring that each segment that the source sends arrives at the destination
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

35. Port 25 is?
Purpose - ownership - and geographic location are key ways to divide a network
Telnet
SMTP
UDP - it sends datagrams as 'best effort'

36. Port 443 is?
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
49152 - 65535.
HTTPS (Secure HTTP)

37. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
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
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
Decapsulation
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

38. What is the proper order of SYN sequence?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It means ensuring that each segment that the source sends arrives at the destination
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper

39. Port 8080 is?
An alternate HTTP port
1
UDP
TCP uses flow control

40. Port 20 is?
Unique
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
FTP

41. UDP stands for?
POP3
User Datagram Protocol
Upper
Netstat -r and route print

42. Port 194 is?
Routing table
Reliable - connection-oriented protocol (resends if not received)
Packet
IRC

43. During data transfer - What is the receiving host responsible for?
TCP
Destination network - next-hop - metric
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.
Acknowledgment and reassembly (receipt of packets and putting them in right order)

44. Which of the following is true about IP?

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45. The router a network uses to send and receive messages beyond the network is called a ___________ router.
FTP
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
Gateway
Reliable - connection-oriented protocol (resends if not received)

46. What is the purpose of TCP/UDP port numbers?
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
53
User Datagram Protocol
To track the different conversations crossing the network at the same time

47. Port 520 is?
RIP (Routing Information Protocol)
53
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

48. IP requires that each sending and receiving device have a __________ IP address.
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
TCP
Unique
128

49. What is contained in the header of each segment or datagram?
The source and destination port number
POP3
FTP
Gateway

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

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Cisco Network Fundamentals - 2

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