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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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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 is a connection-oriented protocol - TCP or 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
20 and 8
TCP
1

2. What is the port range for dynamic or private ports
UDP
Packet
FTP
49152 - 65535.

3. Which is a connectionless protocol - UDP or TCP?
UDP
49152 - 65535.
Destination network - next-hop - metric
Not - these are done by other protocols in other layers

4. Port 20 is?
TCP
FTP
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
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

5. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
RIP (Routing Information Protocol)
TCP uses flow control
Synchronize sequence numbers
HTTPS (Secure HTTP)

6. Port 23 is?
53
An alternate HTTP port
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
Telnet

7. Why does TCP use a sequence number in the header?
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
1
TCP uses flow control

8. ACK is?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Forward the packet to the default route interface (gateway) or just drop/discard the packets
TCP
Acknowledgment field significant

9. What is contained in the header of each segment or datagram?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
All
HTTPS (Secure HTTP)
The source and destination port number

10. Port 443 is?
HTTPS (Secure HTTP)
Reliable - connection-oriented protocol (resends if not received)
All
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. 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)
Data link - physical
128
49152 - 65535.
FIN

12. Port 8080 is?
Not - these are done by other protocols in other layers
Forward the packet to the default route interface (gateway) or just drop/discard the packets
An alternate HTTP port
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

13. UDP does or does not create a session?
Does not
Routers (the subnetting process)
Upper
It is the most common - and it encapsulates transport layer segments

14. What is the purpose of TCP/UDP port numbers?
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
To track the different conversations crossing the network at the same time
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
The source and destination port number

15. List three network applications that use UDP
Transport
Not - these are done by other protocols in other layers
DNS - video-streaming - VoIP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

16. What does segmentation provide to communications?
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
RIP (Routing Information Protocol)
All
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

17. What are the transport layer's responsibilities?
Maximum transmission unit
HTTPS (Secure HTTP)
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

18. Routers add routes for the connected networks to their ________________ .
All
Acknowledgment field significant
53
Routing table

19. What four tasks does the network layer perform?
It works the same on all Layer 1 media
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP
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

20. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
Decapsulation
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
20 and 8

21. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
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
Not - these are done by other protocols in other layers
POP3
Routers (the subnetting process)

22. What are the three basic characteristics of IPv4?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
53
Connectionless - Best effort (unreliable) - media independent
20 and 8

23. The three main features of routes in a routing table are?
Packet
Synchronize sequence numbers
Destination network - next-hop - metric
Connectionless

24. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
SMTP
The source and destination port number
32 - there are four octets of 8 bits each in an IPv4 address
Upper

25. Port 25 is?
Reliable - connection-oriented protocol (resends if not received)
SMTP
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.
Decapsulation

26. List three network applications that use TCP
TCP
Web browsing - email - file transfer
It Doesn't - TCP does
Routing table

27. 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.
DNS - video-streaming - VoIP
IRC
Data link - physical
TCP uses flow control

28. UDP stands for?
To track the different conversations crossing the network at the same time
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP
User Datagram Protocol

29. How does UDP keep track of sequence numbers?

30. How many bytes of overhead do TCP segments carry? How many does UDP carry?
It works the same on all Layer 1 media
Window size
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.
20 and 8

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

32. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
It means ensuring that each segment that the source sends arrives at the destination
Acknowledgment field significant

33. The three-way handshake performs what three functions?
1
Decapsulation
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.
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

34. In networking terms - What is reliability?
POP3
It means ensuring that each segment that the source sends arrives at the destination
Not - these are done by other protocols in other layers
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.

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

36. What is the purpose of the ToS field in the IPv4 header?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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.
POP3

37. Port 194 is?
Purpose - ownership - and geographic location are key ways to divide a network
IRC
HTTPS (Secure HTTP)
20 and 8

38. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
1
Routing table
Decapsulation

39. Which of the following are true about static and dynamic routing?
Synchronize sequence numbers
Unique
Gateway
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

40. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Decapsulation
DNS - video-streaming - VoIP

41. Port 520 is?
Web browsing - email - file transfer
53
RIP (Routing Information Protocol)
Gateway

42. What is a broadcast domain?
An alternate HTTP port
TCP. It makes larger demands on a network
Acknowledgment field significant
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

43. Which of the following is true about IP?

44. Dynamic ports fall into what category of port
SMTP
TCP uses flow control
It works the same on all Layer 1 media
Ephermeral

45. The value of the ACK number field is equal to the client ISN plus ___________ (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
To track the different conversations crossing the network at the same time
Acknowledgment and reassembly (receipt of packets and putting them in right order)
1

46. Are well known ports registered
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
The default gateway address is the address of a router interface that is connected to the same network as the host.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

47. What is the port range for Registered ports
FTP
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Telnet

48. Pieces of information about a route that a routing table contains
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.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Upper

49. Port 69 is?
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
UDP - it sends datagrams as 'best effort'
TFTP - Trivial File Transfer Protocol
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

50. TCP is a ________________ layer protocol.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
The default gateway address is the address of a router interface that is connected to the same network as the host.
It is the most common - and it encapsulates transport layer segments
Transport