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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 a broadcast domain?
SMTP
Destination network - next-hop - metric
The default gateway address is the address of a router interface that is connected to the same network as the host.
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

2. Are well known ports registered
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless - Best effort (unreliable) - media independent
Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

3. Which is a connection-oriented protocol - TCP or UDP?
TCP
Gateway
Decapsulation
Connectionless - Best effort (unreliable) - media independent

4. Port 20 is?
An alternate HTTP port
SMTP
FTP
HTTPS (Secure HTTP)

5. What is the port range for well known ports
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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 #
POP3

6. TCP header provides for
Acknowledgment field significant
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

7. What is the netstat utility used for on a 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
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
Does not

8. Which of the following is true about IP?

9. What is contained in the header of each segment or datagram?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
The source and destination port number
Telnet
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

10. What kinds of problems are caused by excessive broadcast traffic on a network segment?
False. It's like a file - only one process can read/write.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It works the same on all Layer 1 media
DNS - video-streaming - VoIP

11. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
1
To track the different conversations crossing the network at the same time
Gateway
Connectionless

12. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Upper
Window size
TCP uses flow control
To track the different conversations crossing the network at the same time

13. ACK is?
Acknowledgment field significant
Data link - physical
It Doesn't - TCP does
UDP

14. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
Routers (the subnetting process)
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.
The default gateway address is the address of a router interface that is connected to the same network as the host.

15. Which of the following are true about network layer encapsulation?
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

16. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
An alternate HTTP port
Routing table
The source and destination port number

17. What is the proper order of SYN sequence?
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
49152 - 65535.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
128

18. Port 520 is?
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
RIP (Routing Information Protocol)
It means ensuring that each segment that the source sends arrives at the destination
An alternate HTTP port

19. What is the purpose of sequence numbers?
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
Allows the transport layer function on the destination host to reassemble segments in the right order
DNS - video-streaming - VoIP
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

20. What is the proper order of FIN sequence?
Reliable - connection-oriented protocol (resends if not received)
Routing table
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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

21. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
128
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Upper
TCP

22. Ephermeral port is what type of port
Dynamic / private
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Upper
It works the same on all Layer 1 media

23. 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.
Maximum transmission unit
UDP
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

24. What is the default DNS port number?
TCP uses flow control
Gateway
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
53

25. How many bytes of overhead do TCP segments carry? How many does UDP carry?
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
TCP uses flow control
49152 - 65535.
20 and 8

26. On a particular network how would you determine the default gateway address for a host?
The default gateway address is the address of a router interface that is connected to the same network as the host.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific 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

27. What does segmentation provide to communications?
The default gateway address is the address of a router interface that is connected to the same network as the host.
UDP
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Forward the packet to the default route interface (gateway) or just drop/discard the packets

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?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
UDP
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
Static routing

29. Port 23 is?
It is the most common - and it encapsulates transport layer segments
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Telnet

30. Port 69 is?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Maximum transmission unit
POP3
TFTP - Trivial File Transfer Protocol

31. 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
Ephermeral
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

33. What are the transport layer's responsibilities?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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

34. What two commands can be used to view a host's routing table?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Upper
FIN
Netstat -r and route print

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

36. 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
Synchronize sequence numbers
20 and 8
Destination network - next-hop - metric

37. IP is designed or not designed to track and manage the flow of packets?
Synchronize sequence numbers
It means ensuring that each segment that the source sends arrives at the destination
49152 - 65535.
Not - these are done by other protocols in other layers

38. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Synchronize sequence numbers
Window size
The source and destination port number

39. MTU stands for ?
Routing table
All
Routers (the subnetting process)
Maximum transmission unit

40. What four tasks does the network layer perform?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It Doesn't - TCP does
FTP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

41. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
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
HTTPS (Secure HTTP)

42. How does UDP keep track of sequence numbers?

43. Which of the following are true about IP?
TCP
False. It's like a file - only one process can read/write.
It is the most common - and it encapsulates transport layer segments
UDP

44. The three main features of routes in a routing table are?
53
Unique
Destination network - next-hop - metric
TCP

45. What are the three basic characteristics of IPv4?
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
HTTPS (Secure HTTP)
TCP
Connectionless - Best effort (unreliable) - media independent

46. 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
TFTP - Trivial File Transfer Protocol
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.
It means ensuring that each segment that the source sends arrives at the destination

47. What are three key factors to consider when grouping hosts into a common network?
All
TFTP - Trivial File Transfer Protocol
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.

48. Port 25 is?
Netstat -r and route print
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
An alternate HTTP port
SMTP

49. List three network applications that use TCP
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
Web browsing - email - file transfer
Acknowledgment field significant
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

50. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
The source and destination port number
Destination network - next-hop - metric
SMTP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.