Test your basic knowledge |

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. TCP is a ________________ layer protocol.
TFTP - Trivial File Transfer Protocol
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Transport

2. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Destination network - next-hop - metric
TCP. It makes larger demands on a network
User Datagram Protocol
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

3. 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
It means ensuring that each segment that the source sends arrives at the destination
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.
Connectionless - Best effort (unreliable) - media independent

4. How does UDP keep track of sequence numbers?

5. What is the proper order of SYN sequence?
Telnet
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Acknowledgment and reassembly (receipt of packets and putting them in right order)
IRC

6. 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
TCP
UDP
Destination network - next-hop - metric

7. Which of the following are true about network layer encapsulation?
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
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 network - next-hop - metric
Reliable - connection-oriented protocol (resends if not received)

8. What information does a router need to successfully forward packets?
Data link - physical
Destination network - next-hop - metric
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

9. The three main features of routes in a routing table are?
Routers (the subnetting process)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP - it sends datagrams as 'best effort'
Destination network - next-hop - metric

10. Port 69 is?
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.
TFTP - Trivial File Transfer Protocol
Static routing
FTP

11. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Web browsing - email - file transfer
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Packet

12. 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.
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
Transport
Data link - physical
Routers (the subnetting process)

13. 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.
TCP
UDP - it sends datagrams as 'best effort'
Gateway

14. What are the three basic characteristics of IPv4?
Does not
The source and destination port number
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.
Connectionless - Best effort (unreliable) - media independent

15. Which of the following are true about static and dynamic routing?
Allows the transport layer function on the destination host to reassemble segments in the right order
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
1
49152 - 65535.

16. 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
TCP. It makes larger demands on a network
Purpose - ownership - and geographic location are key ways to divide a network
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

17. Ephermeral port is what type of port
The source and destination port number
128
Ephermeral
Dynamic / private

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

19. Port 520 is?
Dynamic / private
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
RIP (Routing Information Protocol)
49152 - 65535.

20. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
20 and 8
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
False. It's like a file - only one process can read/write.
Upper

21. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
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
1
TCP uses flow control

22. What is the purpose of sequence numbers?
Netstat -r and route print
Allows the transport layer function on the destination host to reassemble segments in the right order
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
1

23. IP requires that each sending and receiving device have a __________ IP address.
Reliable - connection-oriented protocol (resends if not received)
20 and 8
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Unique

24. What is the purpose of the ToS field in the IPv4 header?
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
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.
Ephermeral
DNS - video-streaming - VoIP

25. List three network applications that use TCP
Dynamic / private
It means ensuring that each segment that the source sends arrives at the destination
To track the different conversations crossing the network at the same time
Web browsing - email - file transfer

26. During data transfer - What is the receiving host responsible for?
Routing table
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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

27. List three network applications that use UDP
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
DNS - video-streaming - VoIP
TFTP - Trivial File Transfer Protocol
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

28. Port 20 is?
TCP
UDP
FIN
FTP

29. In networking terms - What is reliability?
Routers (the subnetting process)
Synchronize sequence numbers
It means ensuring that each segment that the source sends arrives at the destination
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

30. Which is a connection-oriented protocol - 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
It is the most common - and it encapsulates transport layer segments
TCP
IRC

31. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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.
Allows the transport layer function on the destination host to reassemble segments in the right order
Window size
Packet

32. SYN is?
Ephermeral
RIP (Routing Information Protocol)
DNS - video-streaming - VoIP
Synchronize sequence numbers

33. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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.

34. Why does TCP use a sequence number in the header?
Unique
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
Web browsing - email - file transfer

35. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
128
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.

36. Port 8080 is?
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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless - Best effort (unreliable) - media independent
An alternate HTTP port

37. TCP header provides for
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Connectionless - Best effort (unreliable) - media independent
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless

38. What two commands can be used to view a host's routing table?
To track the different conversations crossing the network at the same time
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Netstat -r and route print
POP3

39. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Allows the transport layer function on the destination host to reassemble segments in the right order
Static routing
20 and 8

40. What is the netstat utility used for on a host?
128
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
49152 - 65535.
DNS - video-streaming - VoIP

41. What does segmentation provide to communications?
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.
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

42. UDP does or does not create a session?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Does not
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

43. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Web browsing - email - file transfer
Unique
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Connectionless

44. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Netstat -r and route print
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
It is the most common - and it encapsulates transport layer segments
Gateway

45. What is the proper order of FIN sequence?
An alternate HTTP 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.
Connectionless
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

46. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Web browsing - email - file transfer
IRC
Connectionless
Purpose - ownership - and geographic location are key ways to divide a network

47. Port 443 is?
IRC
HTTPS (Secure HTTP)
Connectionless
It Doesn't - TCP does

48. ACK is?
Acknowledgment field significant
Synchronize sequence numbers
TCP. It makes larger demands on a network
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

49. 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)
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FIN
Connectionless - Best effort (unreliable) - media independent

50. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Maximum transmission unit
UDP - it sends datagrams as 'best effort'