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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. Port 69 is?
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.
TFTP - Trivial File Transfer 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.
Web browsing - email - file transfer

2. How many bits are in an IPv4 address?
DNS - video-streaming - VoIP
32 - there are four octets of 8 bits each in an IPv4 address
Transport
TFTP - Trivial File Transfer Protocol

3. The three main features of routes in a routing table are?
Routing table
Netstat -r and route print
HTTPS (Secure HTTP)
Destination network - next-hop - metric

4. UDP stands for?
Upper
User Datagram Protocol
Packet
Not - these are done by other protocols in other layers

5. On a particular network how would you determine the default gateway address for a host?
DNS - video-streaming - VoIP
Gateway
An alternate HTTP port
The default gateway address is the address of a router interface that is connected to the same network as the host.

6. Why does TCP use a sequence number in the header?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless
TCP uses flow control
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

7. TCP is a ________________ layer protocol.
FTP
UDP
Upper
Transport

8. TCP header provides for
128
The default gateway address is the address of a router interface that is connected to the same network as the host.
1
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

9. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
The source and destination port number
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.
Destination network - next-hop - metric

10. Port 194 is?
IRC
TFTP - Trivial File Transfer Protocol
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
The source and destination port number

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

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12. 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.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Data link - physical
Upper

13. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Reliable - connection-oriented protocol (resends if not received)
RIP (Routing Information Protocol)
TCP

14. What is the port range for dynamic or private ports
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
49152 - 65535.
Does not
Connectionless

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

16. 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.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific 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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

17. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in 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.
Connectionless - Best effort (unreliable) - media independent
128

18. What is the protocol number for UDP?
Not - these are done by other protocols in other layers
Dynamic / private
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

19. What information does a router need to successfully forward packets?
Packet
It Doesn't - TCP does
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
User Datagram Protocol

20. Pieces of information about a route that a routing table contains
An alternate HTTP port
FTP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
SMTP

21. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless
It Doesn't - TCP does
Transport

22. What is the default DNS port number?
TCP
All
53
POP3

23. What two commands can be used to view a host's routing table?
Allows the transport layer function on the destination host to reassemble segments in the right order
Netstat -r and route print
Data link - physical
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

24. 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
Data link - physical
HTTPS (Secure HTTP)
Reliable - connection-oriented protocol (resends if not received)

25. Ephermeral port is what type of port
Dynamic / private
Upper
User Datagram Protocol
Reliable - connection-oriented protocol (resends if not received)

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

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27. List three network applications that use TCP
Netstat -r and route print
Does not
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer

28. Which is a connection-oriented protocol - TCP or UDP?
TCP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Forward the packet to the default route interface (gateway) or just drop/discard the packets
HTTPS (Secure HTTP)

29. What is the proper order of FIN sequence?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
The default gateway address is the address of a router interface that is connected to the same network as the host.
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.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

30. Are well known ports registered
Purpose - ownership - and geographic location are key ways to divide a network
It works the same on all Layer 1 media
It means ensuring that each segment that the source sends arrives at the destination
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

31. What is the purpose of the ToS field in the IPv4 header?
Ephermeral
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
FTP
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.

32. Which of the following are true about network layer encapsulation?
To track the different conversations crossing the network at the same time
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
User Datagram Protocol

33. Port 8080 is?
Purpose - ownership - and geographic location are key ways to divide a network
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.
An alternate HTTP port
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

34. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
HTTPS (Secure HTTP)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
20 and 8

35. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
An alternate HTTP port
Window size
TCP uses flow control
UDP - it sends datagrams as 'best effort'

36. Why is IP 'media independent'?
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.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
It works the same on all Layer 1 media
Netstat -r and route print

37. MSN messenger uses TCP or UDP?
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
FTP
Maximum transmission unit

38. Which of the following are true about IP?
All
It is the most common - and it encapsulates transport layer segments
TFTP - Trivial File Transfer Protocol
It means ensuring that each segment that the source sends arrives at the destination

39. Which of the following are not functions of the network layer?
Routing table
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
To track the different conversations crossing the network at the same time

40. 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?
It is the most common - and it encapsulates transport layer segments
False. It's like a file - only one process can read/write.
The source and destination port number
TCP uses flow control

41. The three-way handshake performs what three functions?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport 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
Packet
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

42. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
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.
TFTP - Trivial File Transfer Protocol
To track the different conversations crossing the network at the same time

43. Port 20 is?
FTP
Data link - physical
53
Static routing

44. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
It works the same on all Layer 1 media
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
Connectionless - Best effort (unreliable) - media independent

45. Port 23 is?
Telnet
Gateway
Packet
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.

46. What kinds of problems are caused by excessive broadcast traffic on a network segment?
An alternate HTTP port
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It means ensuring that each segment that the source sends arrives at the destination
Web browsing - email - file transfer

47. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Not - these are done by other protocols in other layers
RIP (Routing Information Protocol)

48. Which of the following is true about IP?

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49. ACK is?
Does not
Acknowledgment field significant
HTTPS (Secure HTTP)
Upper

50. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
False. It's like a file - only one process can read/write.
Acknowledgment field significant
32 - there are four octets of 8 bits each in an IPv4 address