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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. In networking terms - What is reliability?
An alternate HTTP port
It means ensuring that each segment that the source sends arrives at the destination
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
Purpose - ownership - and geographic location are key ways to divide a network

2. Are well known ports registered
TFTP - Trivial File Transfer Protocol
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
To track the different conversations crossing the network at the same time
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

3. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
It Doesn't - TCP does
All
Connectionless
53

4. What does segmentation provide to communications?
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.
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

5. What two commands can be used to view a host's routing table?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Purpose - ownership - and geographic location are key ways to divide a network
Netstat -r and route print

6. Why does TCP use a sequence number in the header?
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
POP3
Web browsing - email - file transfer

7. 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
Routing table
Connectionless
Decapsulation

8. Port 25 is?
All
TFTP - Trivial File Transfer Protocol
SMTP
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.

9. 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)
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
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
FIN
RIP (Routing Information Protocol)

10. Which protocol ensures more reliable delivery between applications - TCP or 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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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. It makes larger demands on a network

11. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
False. It's like a file - only one process can read/write.
Reliable - connection-oriented protocol (resends if not received)

12. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Ephermeral
20 and 8

13. What is the port range for dynamic or private ports
Synchronize sequence numbers
SMTP
49152 - 65535.
Destination network - next-hop - metric

14. Ephermeral port is what type of port
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic / private
IRC

15. What is the port range for Registered ports
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 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
FTP
Routers (the subnetting process)

16. What is contained in the header of each segment or datagram?
Not - these are done by other protocols in other layers
To track the different conversations crossing the network at the same time
The source and destination port number
It means ensuring that each segment that the source sends arrives at the destination

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

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18. What are three key factors to consider when grouping hosts into a common network?
Routers (the subnetting process)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Purpose - ownership - and geographic location are key ways to divide a network
It works the same on all Layer 1 media

19. Port 110 is?
Transport
The source and destination port number
FIN
POP3

20. Which of the following are true about network layer encapsulation?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Decapsulation
Routing table
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.

21. What is the netstat utility used for on a host?
It works the same on all Layer 1 media
Decapsulation
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

22. ACK is?
It is the most common - and it encapsulates transport layer segments
128
Acknowledgment field significant
Acknowledgment and reassembly (receipt of packets and putting them in right order)

23. Port 194 is?
IRC
Data link - physical
49152 - 65535.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

24. 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
32 - there are four octets of 8 bits each in an IPv4 address
Window size
The default gateway address is the address of a router interface that is connected to the same network as the host.

25. What are the transport layer's responsibilities?
Unique
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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

26. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Telnet
1
UDP - it sends datagrams as 'best effort'
Gateway

27. What is a broadcast domain?
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
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
Synchronize sequence numbers
Netstat -r and route print

28. Port 69 is?
Allows the transport layer function on the destination host to reassemble segments in the right order
Netstat -r and route print
TFTP - Trivial File Transfer Protocol
Ephermeral

29. Which of the following is true about IP?

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30. What is the purpose of TCP/UDP port numbers?
HTTPS (Secure HTTP)
It works the same on all Layer 1 media
To track the different conversations crossing the network at the same time
The source and destination port number

31. What are the three basic characteristics of IPv4?
Synchronize sequence numbers
Connectionless - Best effort (unreliable) - media independent
Acknowledgment field significant
49152 - 65535.

32. UDP stands for?
User Datagram Protocol
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
HTTPS (Secure HTTP)
Routing table

33. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Connectionless
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Maximum transmission unit

34. Name the private address blocks
Window size
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
Unique

35. What is the purpose of sequence numbers?
Telnet
Allows the transport layer function on the destination host to reassemble segments in the right order
It Doesn't - TCP does
Web browsing - email - file transfer

36. Dynamic ports fall into what category of port
Ephermeral
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
Routers (the subnetting process)

37. Which is a connectionless protocol - UDP or TCP?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
UDP
1
Static routing

38. What is the protocol number for UDP?
All
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
FIN

39. On a particular network how would you determine the default gateway address for a host?
Connectionless
The default gateway address is the address of a router interface that is connected to the same network as the host.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
User Datagram Protocol

40. IP is designed or not designed to track and manage the flow of packets?
UDP
Acknowledgment field significant
Window size
Not - these are done by other protocols in other layers

41. Why is IP 'media independent'?
Maximum transmission unit
It works the same on all Layer 1 media
SMTP
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

42. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Synchronize sequence numbers
TCP
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.
Packet

43. Which of the following are not functions of the network layer?
UDP
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
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. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Routers (the subnetting process)
Netstat -r and route print
Window size

45. What is the purpose of the ToS field in the IPv4 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.
20 and 8
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
POP3

46. Which is a connection-oriented protocol - TCP or UDP?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP
Netstat -r and route print

47. The three main features of routes in a routing table are?
Destination network - next-hop - metric
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
Ephermeral
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.

48. How many bits are in an IPv6 address?
Dynamic / private
DNS - video-streaming - VoIP
128
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

49. Port 520 is?
IRC
RIP (Routing Information Protocol)
20 and 8
Synchronize sequence numbers

50. List three network applications that use UDP
User Datagram Protocol
DNS - video-streaming - VoIP
20 and 8
Unique