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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 8080 is?
An alternate HTTP port
The source and destination port number
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

2. What is the proper order of FIN sequence?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Connectionless
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TFTP - Trivial File Transfer Protocol

3. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
53
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Routers (the subnetting process)
TCP uses flow control

4. Which of the following is true about IP?

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5. What is the port range for dynamic or private ports
Upper
49152 - 65535.
TCP
Routing table

6. How does UDP keep track of sequence numbers?

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7. Port 25 is?
Telnet
Connectionless - Best effort (unreliable) - media independent
POP3
SMTP

8. How many bits are in an IPv6 address?
UDP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
128
SMTP

9. What is a broadcast domain?
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 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
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
IRC

10. UDP does or does not create a session?
Connectionless - Best effort (unreliable) - media independent
Static routing
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
Does not

11. What is the proper order of SYN sequence?
Does not
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It means ensuring that each segment that the source sends arrives at the destination

12. Which protocol ensures more reliable delivery between applications - TCP or UDP?
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. It makes larger demands on a network
Telnet
1

13. What information does a router need to successfully forward packets?
Purpose - ownership - and geographic location are key ways to divide a network
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
IRC

14. In networking terms - What is reliability?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It means ensuring that each segment that the source sends arrives at the destination
HTTPS (Secure HTTP)
32 - there are four octets of 8 bits each in an IPv4 address

15. Port 194 is?
IRC
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Unique
Ephermeral

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

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17. Which is a connection-oriented protocol - 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.
Upper
TFTP - Trivial File Transfer Protocol
TCP

18. How many bits are in an IPv4 address?
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
To track the different conversations crossing the network at the same time
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

19. ACK is?
Acknowledgment field significant
Dynamic / private
Connectionless - Best effort (unreliable) - media independent
It Doesn't - TCP does

20. Ephermeral port is what type of port
Transport
SMTP
TFTP - Trivial File Transfer Protocol
Dynamic / private

21. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Reliable - connection-oriented protocol (resends if not received)
53
Acknowledgment and reassembly (receipt of packets and putting them in right order)

22. What are the transport layer's responsibilities?
53
Ephermeral
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
Upper

23. Why is IP 'media independent'?
SMTP
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It works the same on all Layer 1 media

24. What is the purpose of sequence numbers?
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
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

25. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
TCP
Upper
Telnet
1

26. 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)
To track the different conversations crossing the network at the same time
FIN
53

27. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Acknowledgment field significant
Packet
The default gateway address is the address of a router interface that is connected to the same network as the host.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

28. 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.
All
1
Data link - physical
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

29. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
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

30. 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?
Gateway
The source and destination port number
Static routing
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

31. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
53
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.

32. MTU stands for ?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Connectionless - Best effort (unreliable) - media independent
Maximum transmission unit
Ephermeral

33. Port 23 is?
Telnet
Unique
SMTP
UDP - it sends datagrams as 'best effort'

34. Port 443 is?
TCP
Reliable - connection-oriented protocol (resends if not received)
TCP
HTTPS (Secure HTTP)

35. Routers add routes for the connected networks to their ________________ .
TCP
Connectionless
Routing table
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.

36. What is contained in the header of each segment or datagram?
The source and destination port number
49152 - 65535.
DNS - video-streaming - VoIP
Synchronize sequence numbers

37. Why does TCP use a sequence number in the header?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FTP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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

38. 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.
Connectionless - Best effort (unreliable) - media independent
UDP - it sends datagrams as 'best effort'
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.

39. Port 110 is?
53
POP3
Telnet
49152 - 65535.

40. The three main features of routes in a routing table are?
Destination network - next-hop - metric
Static 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
Window size

41. Are well known ports registered
Reliable - connection-oriented protocol (resends if not received)
TCP
Data link - physical
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

42. 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
HTTPS (Secure HTTP)
Decapsulation
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. SYN is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Synchronize sequence numbers
Unique
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

44. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
53
Routers (the subnetting process)
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.
Window size

45. Which is a connectionless protocol - UDP or TCP?
UDP
All
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Window size

46. What two commands can be used to view a host's routing table?
Netstat -r and route print
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
The default gateway address is the address of a router interface that is connected to the same network as the host.

47. What is the port range for well known ports
Destination network - next-hop - metric
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

48. The router a network uses to send and receive messages beyond the network is called a ___________ router.
The default gateway address is the address of a router interface that is connected to the same network as the host.
TCP
Gateway
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

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

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50. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Reliable - connection-oriented protocol (resends if not received)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TFTP - Trivial File Transfer Protocol
1

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Cisco Network Fundamentals - 2

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