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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. On a particular network how would you determine the default gateway address for a host?
Packet
SMTP
False. It's like a file - only one process can read/write.
The default gateway address is the address of a router interface that is connected to the same network as the host.

2. What is the netstat utility used for on a host?
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
To track the different conversations crossing the network at the same time
It Doesn't - TCP does
TCP. It makes larger demands on a network

3. What two commands can be used to view a host's routing table?
UDP
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
Static routing
Netstat -r and route print

4. SYN is?
Maximum transmission unit
Telnet
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Synchronize sequence numbers

5. Which of the following are not functions of the network layer?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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.
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
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

6. 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?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
TCP uses flow control
FTP
Telnet

7. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper
Maximum transmission unit

8. 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
POP3
49152 - 65535.

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.
Purpose - ownership - and geographic location are key ways to divide a network
Data link - physical
HTTPS (Secure HTTP)
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.

10. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Maximum transmission unit
Connectionless - Best effort (unreliable) - media independent
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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

11. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
User Datagram Protocol
Reliable - connection-oriented protocol (resends if not received)
TCP

12. What are the transport layer's responsibilities?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Routers (the subnetting process)
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
User Datagram Protocol

13. What does segmentation provide to communications?
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
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.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

14. The three main features of routes in a routing table are?
RIP (Routing Information Protocol)
Destination network - next-hop - metric
UDP - it sends datagrams as 'best effort'
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

15. ACK is?
53
Acknowledgment field significant
FIN
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

16. Port 20 is?
32 - there are four octets of 8 bits each in an IPv4 address
FTP
FIN
HTTPS (Secure HTTP)

17. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It means ensuring that each segment that the source sends arrives at the destination
Window size
Decapsulation

18. Port 194 is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Acknowledgment field significant
It Doesn't - TCP does
IRC

19. 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
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
Synchronize sequence numbers
An alternate HTTP port

20. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
IRC
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Web browsing - email - file transfer

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

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22. Port 443 is?
HTTPS (Secure HTTP)
Packet
TFTP - Trivial File Transfer Protocol
Not - these are done by other protocols in other layers

23. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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.
32 - there are four octets of 8 bits each in an IPv4 address
Packet

24. Which of the following are true about network layer encapsulation?
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.
Window size
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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

25. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Packet
The source and destination port number
TCP

26. Dynamic ports fall into what category of port
Packet
Ephermeral
Routers (the subnetting process)
The default gateway address is the address of a router interface that is connected to the same network as the host.

27. Routers add routes for the connected networks to their ________________ .
Destination network - next-hop - metric
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Routing table
Netstat -r and route print

28. Port 8080 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
Does not
An alternate HTTP port
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

29. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
DNS - video-streaming - VoIP
TCP uses flow control
TCP

30. What is a broadcast domain?
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.
IRC
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
TCP. It makes larger demands on a network

31. What is the port range for Registered ports
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
HTTPS (Secure HTTP)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

32. Port 25 is?
SMTP
An alternate HTTP port
IRC
It Doesn't - TCP does

33. IP is designed or not designed to track and manage the flow of packets?
Purpose - ownership - and geographic location are key ways to divide a network
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Not - these are done by other protocols in other layers

34. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
User Datagram Protocol
It works the same on all Layer 1 media
POP3

35. In networking terms - What is reliability?
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
It means ensuring that each segment that the source sends arrives at the destination
49152 - 65535.
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

36. Which of the following is true about IP?

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37. What is the protocol number for UDP?
FIN
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Data link - physical

38. How many bits are in an IPv6 address?
Does not
POP3
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
128

39. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
FTP
Synchronize sequence numbers
Acknowledgment and reassembly (receipt of packets and putting them in right order)

40. 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)
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
FIN
Acknowledgment field significant
128

41. Why is IP 'media independent'?
RIP (Routing Information Protocol)
Routing table
53
It works the same on all Layer 1 media

42. Which protocol ensures more reliable delivery between applications - TCP or UDP?
POP3
To track the different conversations crossing the network at the same time
Dynamic / private
TCP. It makes larger demands on a network

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

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44. The router a network uses to send and receive messages beyond the network is called a ___________ router.
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Gateway

45. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Window size
False. It's like a file - only one process can read/write.
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

46. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
Ephermeral
49152 - 65535.
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

47. Which is a connection-oriented protocol - TCP or UDP?
An alternate HTTP port
FIN
TCP
It works the same on all Layer 1 media

48. List three network applications that use TCP
Web browsing - email - file transfer
TCP. It makes larger demands on a network
It is the most common - and it encapsulates transport layer segments
Data link - physical

49. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
TCP
Not - these are done by other protocols in other layers
Decapsulation
Packet

50. Port 110 is?
POP3
TCP
Not - these are done by other protocols in other layers
FTP