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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 the netstat utility used for on a host?
IRC
UDP - it sends datagrams as 'best effort'
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

2. How many bits are in an IPv6 address?
Static routing
128
UDP
Transport

3. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Gateway
Dynamic / private

4. Routers add routes for the connected networks to their ________________ .
Web browsing - email - file transfer
TCP uses flow control
TCP
Routing table

5. How does UDP keep track of sequence numbers?

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6. IP requires that each sending and receiving device have a __________ IP address.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Unique
Synchronize sequence numbers
Destination network - next-hop - metric

7. MTU stands for ?
Purpose - ownership - and geographic location are key ways to divide a network
Maximum transmission unit
FTP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

8. What four tasks does the network layer perform?
1
TCP uses flow control
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

9. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
It means ensuring that each segment that the source sends arrives at the destination
To track the different conversations crossing the network at the same time
Packet

10. What are the three basic characteristics of IPv4?
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.
Connectionless - Best effort (unreliable) - media independent
Unique
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

11. What two commands can be used to view a host's routing table?
Netstat -r and route print
RIP (Routing Information Protocol)
HTTPS (Secure HTTP)
TCP

12. What is the port range for Registered ports
Reliable - connection-oriented protocol (resends if not received)
Upper
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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

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

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14. The three main features of routes in a routing table are?
It works the same on all Layer 1 media
User Datagram Protocol
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
Destination network - next-hop - metric

15. Port 194 is?
20 and 8
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
IRC
SMTP

16. IP is designed or not designed to track and manage the flow of packets?
Netstat -r and route print
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Not - these are done by other protocols in other layers
Acknowledgment field significant

17. List three network applications that use TCP
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
IRC
Web browsing - email - file transfer
Synchronize sequence numbers

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

19. 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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Connectionless

20. MSN messenger uses TCP or UDP?
TCP
False. It's like a file - only one process can read/write.
HTTPS (Secure HTTP)
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

21. 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
Connectionless
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
DNS - video-streaming - VoIP

22. Why does TCP use a sequence number in the header?
IRC
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
FIN
Routing table

23. Port 443 is?
Static routing
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
HTTPS (Secure HTTP)

24. What are the transport layer's responsibilities?
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
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer
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

25. List three network applications that use UDP
TCP. It makes larger demands on a network
To track the different conversations crossing the network at the same time
DNS - video-streaming - VoIP
53

26. ACK is?
Acknowledgment field significant
Netstat -r and route print
Routers (the subnetting process)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

27. What information does a router need to successfully forward packets?
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Synchronize sequence numbers
TCP. It makes larger demands on a network

28. 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)
Gateway
Web browsing - email - file transfer
The source and destination port number

29. Which protocol ensures more reliable delivery between applications - TCP or UDP?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
TCP. It makes larger demands on a network
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

30. What are three key factors to consider when grouping hosts into a common network?
Routers (the subnetting process)
Purpose - ownership - and geographic location are key ways to divide a network
FTP
Gateway

31. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
To track the different conversations crossing the network at the same time
53
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

32. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
An alternate HTTP port
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

33. The three-way handshake performs what three functions?
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
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
Reliable - connection-oriented protocol (resends if not received)
RIP (Routing Information Protocol)

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

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35. Which of the following are not functions of the network layer?
Window size
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

36. Port 69 is?
Decapsulation
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
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol

37. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It works the same on all Layer 1 media
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

38. Which is a connection-oriented protocol - TCP or UDP?
HTTPS (Secure HTTP)
Unique
TCP
User Datagram Protocol

39. Which of the following is true about IP?

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40. What does segmentation provide to communications?
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
It Doesn't - TCP does
IRC

41. 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
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.
Routing table
IRC

42. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
The source and destination port number
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.
It is the most common - and it encapsulates transport layer segments
Connectionless

43. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Reliable - connection-oriented protocol (resends if not received)
Window size
Synchronize sequence numbers
Decapsulation

44. Port 110 is?
Synchronize sequence numbers
It is the most common - and it encapsulates transport layer segments
POP3
Packet

45. What is a broadcast domain?
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific 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
The default gateway address is the address of a router interface that is connected to the same network as the host.

46. In networking terms - What is reliability?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

47. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
The source and destination port number
Static routing
Packet
Upper

48. TCP is a ________________ layer protocol.
TFTP - Trivial File Transfer Protocol
RIP (Routing Information Protocol)
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
Transport

49. UDP stands for?
User Datagram Protocol
It works the same on all Layer 1 media
It is the most common - and it encapsulates transport layer segments
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

50. 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?
1
TCP uses flow control
Ephermeral
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts