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. What is the proper order of FIN sequence?
TCP uses flow control
False. It's like a file - only one process can read/write.
Does not
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

2. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Destination network - next-hop - metric
Packet
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

3. Dynamic ports fall into what category of port
Ephermeral
53
It Doesn't - TCP does
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

4. The router a network uses to send and receive messages beyond the network is called a ___________ router.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Gateway
DNS - video-streaming - VoIP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

5. Port 520 is?
Telnet
RIP (Routing Information Protocol)
User Datagram Protocol
Gateway

6. Which of the following is true about IP?

7. 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)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Connectionless
DNS - video-streaming - VoIP
FIN

8. What two commands can be used to view a host's routing table?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Netstat -r and route print
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
It means ensuring that each segment that the source sends arrives at the destination

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

10. Why does TCP use a sequence number in the header?
POP3
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
UDP

11. Port 20 is?
Purpose - ownership - and geographic location are key ways to divide a network
HTTPS (Secure HTTP)
FTP
Decapsulation

12. Why is IP 'media independent'?
Unique
Routing table
False. It's like a file - only one process can read/write.
It works the same on all Layer 1 media

13. 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?
TCP uses flow control
1
Purpose - ownership - and geographic location are key ways to divide a network
The source and destination port number

14. TCP is a ________________ layer protocol.
Transport
SMTP
TCP
Reliable - connection-oriented protocol (resends if not received)

15. The three main features of routes in a routing table are?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Destination network - next-hop - metric
Routers (the subnetting process)
Packet

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

17. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
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
Does not
Decapsulation

18. Ephermeral port is what type of port
Dynamic / private
Data link - physical
The source and destination port number
TCP. It makes larger demands on a network

19. Which is a connection-oriented protocol - TCP or UDP?
Unique
TCP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
1

20. Which of the following are true about static and dynamic routing?
Synchronize sequence numbers
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TCP. It makes larger demands on a network

21. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Does not
It means ensuring that each segment that the source sends arrives at the destination
Not - these are done by other protocols in other layers

22. During data transfer - What is the receiving host responsible for?
128
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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.

23. UDP stands for?
Routing table
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
32 - there are four octets of 8 bits each in an IPv4 address
User Datagram Protocol

24. How many bits are in an IPv6 address?
Maximum transmission unit
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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
128

25. What is the port range for well known ports
The source and destination port number
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Ephermeral
HTTPS (Secure HTTP)

26. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
FIN
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
Purpose - ownership - and geographic location are key ways to divide a network

27. MTU stands for ?
Maximum transmission unit
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Upper
An alternate HTTP port

28. 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?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
Data link - physical
Static routing

29. Port 110 is?
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
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
POP3

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

31. 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
It Doesn't - TCP does
Window size
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

32. How many bits are in an IPv4 address?
Acknowledgment field significant
32 - there are four octets of 8 bits each in an IPv4 address
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.
Not - these are done by other protocols in other layers

33. SYN is?
RIP (Routing Information Protocol)
Synchronize sequence numbers
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
Routers (the subnetting process)

34. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
128
Maximum transmission unit
Telnet
Connectionless

35. The three-way handshake performs what three functions?
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
DNS - video-streaming - VoIP
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

36. What is the purpose of the ToS field in the IPv4 header?
Not - these are done by other protocols in other layers
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.
DNS - video-streaming - VoIP
Unique

37. Encapsulation occurs at all - some or none of the layers of the OSI model?
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
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

38. MSN messenger uses TCP or UDP?
TCP
Upper
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
Not - these are done by other protocols in other layers

39. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Connectionless
53
UDP

40. What is contained in the header of each segment or datagram?
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
Connectionless
The source and destination port number
UDP

41. Routers add routes for the connected networks to their ________________ .
It is the most common - and it encapsulates transport layer segments
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.
Allows the transport layer function on the destination host to reassemble segments in the right order

42. Port 69 is?
The source and destination port number
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TFTP - Trivial File Transfer Protocol
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

43. 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.
Acknowledgment field significant
Telnet
It means ensuring that each segment that the source sends arrives at the destination

44. IP is designed or not designed to track and manage the flow of packets?
Reliable - connection-oriented protocol (resends if not received)
Ephermeral
FIN
Not - these are done by other protocols in other layers

45. 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
49152 - 65535.
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.
TCP. It makes larger demands on a network

46. Which of the following are not functions of the network layer?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Decapsulation
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
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

47. What are three key factors to consider when grouping hosts into a common network?
FIN
The default gateway address is the address of a router interface that is connected to the same network as the host.
Purpose - ownership - and geographic location are key ways to divide a network
Maximum transmission unit

48. Which is a connectionless protocol - UDP or TCP?
Static routing
Purpose - ownership - and geographic location are key ways to divide a network
UDP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

49. IP requires that each sending and receiving device have a __________ IP address.
Unique
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.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

50. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
FIN
Upper
TCP uses flow control
Ephermeral