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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 protocol ensures more reliable delivery between applications - TCP or UDP?
Synchronize sequence numbers
TCP. It makes larger demands on 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
SMTP

2. 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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Reliable - connection-oriented protocol (resends if not received)
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

3. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
TFTP - Trivial File Transfer Protocol
Routers (the subnetting process)
1
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

4. What information does a router need to successfully forward packets?
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
Data link - physical
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
Acknowledgment and reassembly (receipt of packets and putting them in right order)

5. ACK is?
Window size
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 field significant
Connectionless

6. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Packet
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Gateway
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

7. Which is a connection-oriented protocol - TCP or UDP?
TCP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Packet
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

8. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
DNS - video-streaming - VoIP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

9. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless
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
HTTPS (Secure HTTP)

10. Routers add routes for the connected networks to their ________________ .
The source and destination port number
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
Routing table

11. How does UDP keep track of sequence numbers?

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12. On a particular network how would you determine the default gateway address for a host?
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.
HTTPS (Secure HTTP)
The default gateway address is the address of a router interface that is connected to the same network as the host.
Web browsing - email - file transfer

13. What is the port range for well known ports
Acknowledgment and reassembly (receipt of packets and putting them in 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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Ephermeral

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

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15. Port 25 is?
It is the most common - and it encapsulates transport layer segments
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Routers (the subnetting process)
SMTP

16. What is contained in the header of each segment or datagram?
Routers (the subnetting process)
Not - these are done by other protocols in other layers
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
The source and destination port number

17. Port 194 is?
Does not
POP3
UDP - it sends datagrams as 'best effort'
IRC

18. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
32 - there are four octets of 8 bits each in an IPv4 address
Packet
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

19. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
Maximum transmission unit
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

20. SYN is?
False. It's like a file - only one process can read/write.
Synchronize sequence numbers
Window size
It is the most common - and it encapsulates transport layer segments

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

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22. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Upper
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

23. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
An alternate HTTP port

24. Port 69 is?
TFTP - Trivial File Transfer Protocol
Reliable - connection-oriented protocol (resends if not received)
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.
Ephermeral

25. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Reliable - connection-oriented protocol (resends if not received)
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.
Packet

26. Port 23 is?
Telnet
It works the same on all Layer 1 media
20 and 8
Synchronize sequence numbers

27. 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?
Web browsing - email - file transfer
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

28. 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)
Routers (the subnetting process)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Forward the packet to the default route interface (gateway) or just drop/discard the packets

29. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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
Acknowledgment field significant
Netstat -r and route print

30. Why is IP 'media independent'?
It is the most common - and it encapsulates transport layer segments
It works the same on all Layer 1 media
Upper
POP3

31. Name the private address blocks
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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
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
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

32. 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?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Upper
Static routing
Forward the packet to the default route interface (gateway) or just drop/discard the packets

33. What are three key factors to consider when grouping hosts into a common network?
Connectionless - Best effort (unreliable) - media independent
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
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

34. 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)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
FIN
Destination network - next-hop - metric
HTTPS (Secure HTTP)

35. Which of the following are true about static and dynamic routing?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
FTP
FIN
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

36. Which is a connectionless protocol - UDP or TCP?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Netstat -r and route print
UDP
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

37. List three network applications that use UDP
Dynamic / private
Unique
DNS - video-streaming - VoIP
UDP - it sends datagrams as 'best effort'

38. What is the port range for Registered ports
RIP (Routing Information Protocol)
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
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

39. Port 110 is?
It works the same on all Layer 1 media
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.
POP3
Packet

40. Dynamic ports fall into what category of port
SMTP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Ephermeral
Web browsing - email - file transfer

41. The three main features of routes in a routing table are?
Destination network - next-hop - metric
SMTP
Upper
TCP. It makes larger demands on a network

42. Ephermeral port is what type of 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
Dynamic / private
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

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

44. Port 520 is?
TCP
Synchronize sequence numbers
Destination network - next-hop - metric
RIP (Routing Information Protocol)

45. Which of the following are true about network layer encapsulation?
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.
It Doesn't - TCP does
Decapsulation
UDP

46. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
TCP
1
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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.

47. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Reliable - connection-oriented protocol (resends if not received)
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
It works the same on all Layer 1 media

48. During data transfer - What is the receiving host responsible for?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It works the same on all Layer 1 media

49. List three network applications that use TCP
Window size
Web browsing - email - file transfer
128
DNS - video-streaming - VoIP

50. What are the three basic characteristics of IPv4?
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.
The source and destination port number
UDP - it sends datagrams as 'best effort'