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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. What is contained in the header of each segment or datagram?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Synchronize sequence numbers
The source and destination port number
32 - there are four octets of 8 bits each in an IPv4 address

2. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
TCP uses flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

3. What are the three basic characteristics of IPv4?
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
Transport
Connectionless - Best effort (unreliable) - media independent

4. 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?
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.
Static routing
Maximum transmission unit
FIN

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

6. What are the transport layer's responsibilities?
Web browsing - email - file transfer
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
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

7. TCP header provides for
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
The default gateway address is the address of a router interface that is connected to the same network as the host.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Reliable - connection-oriented protocol (resends if not received)

8. 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?
Maximum transmission unit
TCP uses flow control
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.
Telnet

9. How does UDP keep track of sequence numbers?

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10. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
DNS - video-streaming - VoIP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

11. Port 20 is?
Unique
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
FTP
IRC

12. Which of the following are not functions of the network layer?
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
49152 - 65535.
Dynamic / private
Unique

13. Which of the following are true about IP?
False. It's like a file - only one process can read/write.
It is the most common - and it encapsulates transport layer segments
53
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

14. Ephermeral port is what type of port
32 - there are four octets of 8 bits each in an IPv4 address
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
RIP (Routing Information Protocol)
Dynamic / private

15. During data transfer - What is the receiving host responsible for?
Netstat -r and route print
Data link - physical
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Reliable - connection-oriented protocol (resends if not received)

16. Port 69 is?
It Doesn't - TCP does
TFTP - Trivial File Transfer Protocol
FTP
Routers (the subnetting process)

17. The three main features of routes in a routing table are?
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 network - next-hop - metric
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. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

18. Which of the following are true about network layer encapsulation?
It means ensuring that each segment that the source sends arrives at the destination
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.
Synchronize sequence numbers
The default gateway address is the address of a router interface that is connected to the same network as the host.

19. What is the proper order of SYN sequence?
False. It's like a file - only one process can read/write.
It is the most common - and it encapsulates transport layer segments
User Datagram Protocol
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

20. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
It Doesn't - TCP does
POP3
Window size

21. List three network applications that use UDP
DNS - video-streaming - VoIP
Routers (the subnetting process)
32 - there are four octets of 8 bits each in an IPv4 address
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

22. 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.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Decapsulation
Data link - physical
User Datagram Protocol

23. Port 8080 is?
Window size
An alternate HTTP port
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
53

24. What two commands can be used to view a host's routing table?
Netstat -r and route print
It means ensuring that each segment that the source sends arrives at the destination
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

25. Routers add routes for the connected networks to their ________________ .
Routing table
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Static routing
128

26. Which is a connectionless protocol - UDP or TCP?
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
Connectionless - Best effort (unreliable) - media independent
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

27. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Telnet
All
Purpose - ownership - and geographic location are key ways to divide a network
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

28. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
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
Decapsulation
POP3
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.

29. What is the default DNS port number?
53
IRC
TCP
FTP

30. List three network applications that use TCP
Dynamic / private
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
Web browsing - email - file transfer

31. Pieces of information about a route that a routing table contains
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
RIP (Routing Information Protocol)
49152 - 65535.

32. What is the purpose of the ToS field in the IPv4 header?
False. It's like a file - only one process can read/write.
TCP
An alternate HTTP port
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.

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

34. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Synchronize sequence numbers
The source and destination port number
Maximum transmission unit

35. What is the proper order of FIN sequence?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
The source and destination port number
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP

36. UDP stands for?
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.
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.
Static routing
User Datagram Protocol

37. SYN is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Synchronize sequence numbers
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
FTP

38. Why is IP 'media independent'?
It works the same on all Layer 1 media
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Dynamic / private

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

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40. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Connectionless
20 and 8
POP3

41. Which is a connection-oriented protocol - TCP or UDP?
32 - there are four octets of 8 bits each in an IPv4 address
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP

42. What is the purpose of sequence numbers?
Synchronize sequence numbers
Allows the transport layer function on the destination host to reassemble segments in the right order
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
IRC

43. What is a broadcast domain?
Data link - physical
Connectionless
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
Acknowledgment field significant

44. What information does a router need to successfully forward 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
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 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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

45. What is the protocol number for UDP?
32 - there are four octets of 8 bits each in an IPv4 address
All
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

46. ACK is?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Unique
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Acknowledgment field significant

47. How many bits are in an IPv4 address?
Static routing
Maximum transmission unit
32 - there are four octets of 8 bits each in an IPv4 address
Connectionless

48. Name the private address blocks
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
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.
It Doesn't - TCP does
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

49. What is the port range for Registered ports
TCP. It makes larger demands on a network
1
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
IRC

50. Port 23 is?
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
Telnet
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Netstat -r and route print