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 purpose of the ToS field in the IPv4 header?
Ephermeral
An alternate HTTP port
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.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

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

3. What two commands can be used to view a host's routing table?
128
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Synchronize sequence numbers
Netstat -r and route print

4. TCP is a ________________ layer protocol.
Transport
An alternate HTTP port
53
HTTPS (Secure HTTP)

5. What are the transport layer's responsibilities?
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
TCP
Decapsulation

6. UDP does or does not create a session?
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
Does not
20 and 8
Connectionless

7. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Not - these are done by other protocols in other layers
Synchronize sequence numbers
RIP (Routing Information Protocol)

8. 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
UDP - it sends datagrams as 'best effort'
TFTP - Trivial File Transfer Protocol
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

9. 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
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
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
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

10. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Telnet
TCP. It makes larger demands on a network
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.

11. What is the default DNS port number?
The source and destination port number
53
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Purpose - ownership - and geographic location are key ways to divide a network

12. Are well known ports registered
DNS - video-streaming - VoIP
Telnet
Purpose - ownership - and geographic location are key ways to divide a network
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

14. What is contained in the header of each segment or datagram?
SMTP
Decapsulation
False. It's like a file - only one process can read/write.
The source and destination port number

15. 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
128
Routing table
All

16. What four tasks does the network layer perform?
32 - there are four octets of 8 bits each in an IPv4 address
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP - it sends datagrams as 'best effort'
Static routing

17. 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.
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)
Not - these are done by other protocols in other layers

18. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
TCP
Connectionless
TCP uses flow control
Unique

19. Ephermeral port is what type of port
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic / private
RIP (Routing Information Protocol)
TCP uses flow control

20. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Gateway
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Telnet

21. Why is IP 'media independent'?
TCP
It Doesn't - TCP does
It works the same on all Layer 1 media
1

22. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
User Datagram Protocol
Upper
32 - there are four octets of 8 bits each in an IPv4 address
FIN

23. What is the port range for Registered ports
FTP
Routers (the subnetting process)
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
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

24. What is the purpose of sequence numbers?
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
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.
Allows the transport layer function on the destination host to reassemble segments in the right order

25. MSN messenger uses TCP or UDP?
TCP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Static routing
TCP uses flow control

26. Port 8080 is?
An alternate HTTP port
FTP
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.
POP3

27. Port 110 is?
POP3
SMTP
Netstat -r and route print
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

28. Which of the following are true about network layer encapsulation?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
32 - there are four octets of 8 bits each in an IPv4 address
1
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.

29. The three-way handshake performs what three functions?
TFTP - Trivial File Transfer Protocol
POP3
20 and 8
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

30. Port 194 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.
Allows the transport layer function on the destination host to reassemble segments in the right order
IRC
HTTPS (Secure HTTP)

31. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
IRC
It works the same on all Layer 1 media

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

33. List three network applications that use TCP
Transport
Web browsing - email - file transfer
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
Allows the transport layer function on the destination host to reassemble segments in the right order

34. What is the netstat utility used for on a host?
TCP uses flow control
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 #
SMTP

35. Port 69 is?
TFTP - Trivial File Transfer Protocol
Window size
Synchronize sequence numbers
1

36. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
UDP
53
Window size
TCP uses flow control

37. What are three key factors to consider when grouping hosts into a common network?
An alternate HTTP port
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Purpose - ownership - and geographic location are key ways to divide a network
Routing table

38. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
The default gateway address is the address of a router interface that is connected to the same network as the host.
Window size
FTP

39. Port 25 is?
It Doesn't - TCP does
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
SMTP

40. How many bits are in an IPv6 address?
128
Maximum transmission unit
Netstat -r and route print
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

41. Which is a connectionless protocol - UDP or TCP?
Routers (the subnetting process)
FTP
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
UDP

42. MTU stands for ?
Maximum transmission unit
Does not
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP uses flow control

43. Which of the following is true about IP?

44. How many bits are in an IPv4 address?
Transport
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
32 - there are four octets of 8 bits each in an IPv4 address

45. On a particular network how would you determine the default gateway address for a host?
Purpose - ownership - and geographic location are key ways to divide a network
SMTP
The default gateway address is the address of a router interface that is connected to the same network as the host.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

46. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
It Doesn't - TCP does
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

47. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
32 - there are four octets of 8 bits each in an IPv4 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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

48. 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?
Static routing
Reliable - connection-oriented protocol (resends if not received)
49152 - 65535.
32 - there are four octets of 8 bits each in an IPv4 address

49. UDP stands for?
User Datagram Protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
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

50. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Decapsulation
Connectionless - Best effort (unreliable) - media independent
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