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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 25 is?
SMTP
Transport
RIP (Routing Information Protocol)
49152 - 65535.

2. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Telnet
Packet
TFTP - Trivial File Transfer Protocol
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

3. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Ephermeral
It works the same on all Layer 1 media

4. Dynamic ports fall into what category of port
HTTPS (Secure HTTP)
To track the different conversations crossing the network at the same time
TCP
Ephermeral

5. Which of the following are not functions of the network layer?
Purpose - ownership - and geographic location are key ways to divide a network
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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
20 and 8

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

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7. What is the port range for dynamic or private ports
Telnet
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
49152 - 65535.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

8. ACK is?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Acknowledgment field significant
TCP
It is the most common - and it encapsulates transport layer segments

9. UDP does or does not create a session?
Does not
TCP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
User Datagram Protocol

10. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
IRC
Upper
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
The default gateway address is the address of a router interface that is connected to the same network as the host.

11. TCP is a ________________ layer protocol.
It Doesn't - TCP does
Transport
Static routing
Netstat -r and route print

12. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Ephermeral
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP - it sends datagrams as 'best effort'
20 and 8

13. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Ephermeral
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Acknowledgment field significant
53

14. What is the purpose of sequence numbers?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Acknowledgment field significant
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
Allows the transport layer function on the destination host to reassemble segments in the right order

15. Which of the following are true about static and dynamic routing?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Does not

16. Port 520 is?
RIP (Routing Information Protocol)
IRC
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
Telnet

17. What is the proper order of FIN sequence?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
HTTPS (Secure HTTP)
Data link - physical
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

18. Why is IP 'media independent'?
It works the same on all Layer 1 media
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

19. List three network applications that use UDP
Decapsulation
1
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
DNS - video-streaming - VoIP

20. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Purpose - ownership - and geographic location are key ways to divide a network
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
Connectionless
128

21. 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?
UDP - it sends datagrams as 'best effort'
TCP uses flow control
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
Unique

22. Why does TCP use a sequence number in the header?
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
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 works the same on all Layer 1 media
Web browsing - email - file transfer

23. Port 110 is?
POP3
HTTPS (Secure HTTP)
An alternate HTTP port
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

24. Port 8080 is?
Destination network - next-hop - metric
An alternate HTTP port
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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

25. What is the purpose of the ToS field in the IPv4 header?
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.
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
DNS - video-streaming - VoIP
Ephermeral

26. What is the purpose of TCP/UDP port numbers?
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.
POP3
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
To track the different conversations crossing the network at the same time

27. The three main features of routes in a routing table are?
Static routing
Destination network - next-hop - metric
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
The source and destination port number

28. Port 443 is?
To track the different conversations crossing the network at the same time
Data link - physical
The default gateway address is the address of a router interface that is connected to the same network as the host.
HTTPS (Secure HTTP)

29. 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
Allows the transport layer function on the destination host to reassemble segments in the right order
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Dynamic / private

30. 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?
Packet
Static routing
DNS - video-streaming - VoIP
Routing table

31. 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?
Acknowledgment field significant
20 and 8
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Purpose - ownership - and geographic location are key ways to divide a network

32. What is the default DNS port number?
128
53
FTP
All

33. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
53
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reliable - connection-oriented protocol (resends if not received)
POP3

34. MTU stands for ?
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
Maximum transmission unit
53
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

35. What is contained in the header of each segment or datagram?
Unique
It is the most common - and it encapsulates transport layer segments
The source and destination port number
Purpose - ownership - and geographic location are key ways to divide a network

36. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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

37. What are three key factors to consider when grouping hosts into a common network?
TCP
Purpose - ownership - and geographic location are key ways to divide a network
Web browsing - email - file transfer
UDP

38. Which is a connection-oriented protocol - TCP or UDP?
Synchronize sequence numbers
128
32 - there are four octets of 8 bits each in an IPv4 address
TCP

39. What are the three basic characteristics of IPv4?
Routers (the subnetting process)
Connectionless
Connectionless - Best effort (unreliable) - media independent
False. It's like a file - only one process can read/write.

40. Ephermeral port is what type of port
TCP
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic / private
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

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42. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
20 and 8
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Maximum transmission unit

43. 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)
FIN
Does not
IRC
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

44. What is the netstat utility used for on a host?
Reliable - connection-oriented protocol (resends if not received)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
RIP (Routing Information 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

45. 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.
Dynamic / private
Data link - physical
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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

46. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
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
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

47. Port 23 is?
Not - these are done by other protocols in other layers
Telnet
Routers (the subnetting process)
It is the most common - and it encapsulates transport layer segments

48. Port 20 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
Unique
FTP
Transport

49. Pieces of information about a route that a routing table contains
128
An alternate HTTP 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.
All

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