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. Port 443 is?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
UDP
HTTPS (Secure HTTP)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

2. What is contained in the header of each segment or datagram?
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
The source and destination port number
Ephermeral

3. Which of the following are true about static and dynamic routing?
49152 - 65535.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

4. ACK 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
Maximum transmission unit
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Acknowledgment field significant

5. UDP does or does not create a session?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Does not
TCP

6. Encapsulation occurs at all - some or none of the layers of the OSI model?
It Doesn't - TCP does
All
1
Connectionless - Best effort (unreliable) - media independent

7. 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.
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.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Window size
Data link - physical

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

9. Why is IP 'media independent'?
Routing table
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It works the same on all Layer 1 media
Netstat -r and route print

10. MSN messenger uses TCP or UDP?
Transport
Destination network - next-hop - metric
TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

11. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
FIN
Packet
Decapsulation
Gateway

12. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
49152 - 65535.
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.
It works the same on all Layer 1 media
Upper

13. How many bits are in an IPv6 address?
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
TFTP - Trivial File Transfer Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.

14. Why does TCP use a sequence number in the header?
RIP (Routing Information Protocol)
1
Static routing
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

15. IP requires that each sending and receiving device have a __________ IP address.
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
Unique
Netstat -r and route print
Acknowledgment field significant

16. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
UDP - it sends datagrams as 'best effort'
Routers (the subnetting process)
Transport

17. TCP is a ________________ layer protocol.
Transport
UDP - it sends datagrams as 'best effort'
Does not
Forward the packet to the default route interface (gateway) or just drop/discard the packets

18. List three network applications that use UDP
DNS - video-streaming - VoIP
53
TCP uses flow control
128

19. How many bytes of overhead do TCP segments carry? How many does UDP carry?
UDP - it sends datagrams as 'best effort'
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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
20 and 8

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

21. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
128
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
Data link - physical

22. 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)
128
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Dynamic / private

23. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
53
It works the same on all Layer 1 media
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Window size

24. Which of the following are not functions of the network layer?
TFTP - Trivial File Transfer Protocol
FIN
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
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

25. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
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
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
1

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

27. The three-way handshake performs what three functions?
All
It means ensuring that each segment that the source sends arrives at the destination
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
Routing table

28. 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)
False. It's like a file - only one process can read/write.
FIN
Destination network - next-hop - metric
HTTPS (Secure HTTP)

29. Name the private address blocks
The default gateway address is the address of a router interface that is connected to the same network as the host.
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 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

30. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
Packet
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

31. What is the port range for dynamic or private ports
49152 - 65535.
TCP
Maximum transmission unit
Unique

32. SYN is?
It works the same on all Layer 1 media
128
Connectionless - Best effort (unreliable) - media independent
Synchronize sequence numbers

33. The three main features of routes in a routing table are?
TFTP - Trivial File Transfer Protocol
An alternate HTTP port
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
Destination network - next-hop - metric

34. What are the three basic characteristics of IPv4?
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
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.
Acknowledgment field significant

35. IP is designed or not designed to track and manage the flow of packets?
Does not
Not - these are done by other protocols in other layers
It Doesn't - TCP does
To track the different conversations crossing the network at the same time

36. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Dynamic / private
TCP. It makes larger demands on a network
Reliable - connection-oriented protocol (resends if not received)
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

37. Port 110 is?
49152 - 65535.
53
32 - there are four octets of 8 bits each in an IPv4 address
POP3

38. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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.
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
Packet

39. Which of the following is true about IP?

40. UDP stands for?
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
User Datagram Protocol
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
The source and destination port number

41. What is the port range for well known ports
SMTP
32 - there are four octets of 8 bits each in an IPv4 address
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

42. What two commands can be used to view a host's routing table?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Gateway
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Netstat -r and route print

43. What is the default DNS port number?
53
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.
Window size

44. Which of the following are true about network layer encapsulation?
Gateway
RIP (Routing Information Protocol)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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.

45. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
TCP
Packet
Static routing
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

46. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Acknowledgment field significant
Decapsulation
An alternate HTTP port
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

47. What information does a router need to successfully forward packets?
Ephermeral
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
Decapsulation

48. In networking terms - What is reliability?
The default gateway address is the address of a router interface that is connected to the same network as the host.
It means ensuring that each segment that the source sends arrives at the destination
RIP (Routing Information Protocol)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

49. What does segmentation provide to communications?
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
It is the most common - and it encapsulates transport layer segments
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

50. What is the netstat utility used for on a host?
Not - these are done by other protocols in other layers
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
Upper
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