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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 the proper order of SYN sequence?
It works the same on all Layer 1 media
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

2. SYN is?
Does not
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
Synchronize sequence numbers
Not - these are done by other protocols in other layers

3. Which is a connection-oriented protocol - TCP or UDP?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Gateway
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

4. What is the port range for dynamic or private ports
49152 - 65535.
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
An alternate HTTP port
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

5. MSN messenger uses TCP or UDP?
FIN
TCP
Data link - physical
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

6. What does segmentation provide to communications?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Upper
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

7. Routers add routes for the connected networks to their ________________ .
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Acknowledgment and reassembly (receipt of packets and putting them in right order)
TFTP - Trivial File Transfer Protocol
Routing table

8. Ports can be shared at the same time? (t/f)

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9. 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
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
Connectionless
Static routing

10. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Window size
Connectionless - Best effort (unreliable) - media independent
Upper

11. What is the default DNS port number?
53
DNS - video-streaming - VoIP
RIP (Routing Information Protocol)
FIN

12. The three-way handshake performs what three functions?
49152 - 65535.
Maximum transmission unit
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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

13. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
POP3

14. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Telnet
RIP (Routing Information Protocol)
Routers (the subnetting process)
Packet

15. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
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.
Packet
Routers (the subnetting process)

16. 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?
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.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
TCP uses flow control
POP3

17. 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
POP3
Telnet
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

18. What are the three basic characteristics of IPv4?
User Datagram Protocol
HTTPS (Secure HTTP)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless - Best effort (unreliable) - media independent

19. MTU 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.
Maximum transmission unit
It is the most common - and it encapsulates transport layer segments
53

20. IP requires that each sending and receiving device have a __________ IP address.
HTTPS (Secure HTTP)
RIP (Routing Information Protocol)
Unique
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

21. 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.
Data link - physical
HTTPS (Secure HTTP)
User Datagram Protocol
32 - there are four octets of 8 bits each in an IPv4 address

22. List three network applications that use UDP
The source and destination port number
Acknowledgment and reassembly (receipt of packets and putting them in right order)
DNS - video-streaming - VoIP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

23. What kinds of problems are caused by excessive broadcast traffic on a network segment?
TCP. It makes larger demands on a network
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Allows the transport layer function on the destination host to reassemble segments in the right order
All

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

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25. What is the purpose of TCP/UDP port numbers?
Does not
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
To track the different conversations crossing the network at the same time
FTP

26. UDP stands for?
49152 - 65535.
It Doesn't - TCP does
IRC
User Datagram Protocol

27. Port 69 is?
Connectionless
TFTP - Trivial File Transfer Protocol
Telnet
User Datagram Protocol

28. What four tasks does the network layer perform?
Telnet
Window size
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Netstat -r and route print

29. 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)
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.
User Datagram Protocol
Window size

30. How many bits are in an IPv6 address?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
128
Ephermeral
It means ensuring that each segment that the source sends arrives at the destination

31. ACK is?
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
FIN
Acknowledgment field significant

32. 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.
To track the different conversations crossing the network at the same time
Web browsing - email - file transfer
POP3

33. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
TCP
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

34. Why does TCP use a sequence number in the header?
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
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
Allows the transport layer function on the destination host to reassemble segments in the right order
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

35. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless - Best effort (unreliable) - media independent
Connectionless
Netstat -r and route print
DNS - video-streaming - VoIP

36. What is the port range for well known ports
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

37. What information does a router need to successfully forward packets?
Routers (the subnetting process)
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
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
SMTP

38. Which of the following are true about static and dynamic routing?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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

39. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Decapsulation
Routers (the subnetting process)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

40. TCP is a ________________ layer protocol.
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
Transport
TFTP - Trivial File Transfer Protocol
Upper

41. Port 520 is?
RIP (Routing Information Protocol)
Transport
Acknowledgment field significant
User Datagram Protocol

42. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
POP3
Window size
Reliable - connection-oriented protocol (resends if not received)

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

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44. The router a network uses to send and receive messages beyond the network is called a ___________ router.
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
Gateway
TCP uses flow control

45. UDP does or does not create a session?
Does not
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
Upper

46. What are the transport layer's responsibilities?
Telnet
RIP (Routing Information 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
Acknowledgment field significant

47. In networking terms - What is reliability?
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.
Purpose - ownership - and geographic location are key ways to divide a network
TCP uses flow control
It means ensuring that each segment that the source sends arrives at the destination

48. Port 20 is?
FTP
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
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

49. Port 194 is?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
An alternate HTTP port
Not - these are done by other protocols in other layers
IRC

50. List three network applications that use TCP
Web browsing - email - file transfer
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.