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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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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. 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?
To track the different conversations crossing the network at the same time
Static routing
TCP uses flow control
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

2. What is the port range for well known ports
Purpose - ownership - and geographic location are key ways to divide a network
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
RIP (Routing Information Protocol)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

3. What is contained in the header of each segment or datagram?
Upper
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 default gateway address is the address of a router interface that is connected to the same network as the host.
The source and destination port number

4. What is the default DNS port number?
It Doesn't - TCP does
TCP
53
Maximum transmission unit

5. IP is designed or not designed to track and manage the flow of packets?
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
Not - these are done by other protocols in other layers
Netstat -r and route print
Purpose - ownership - and geographic location are key ways to divide a network

6. What is the netstat utility used for on a host?
20 and 8
Connectionless
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

7. List three network applications that use TCP
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Web browsing - email - file transfer
Not - these are done by other protocols in other layers

8. Port 443 is?
HTTPS (Secure HTTP)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
32 - there are four octets of 8 bits each in an IPv4 address
It means ensuring that each segment that the source sends arrives at the destination

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

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10. TCP is a ________________ layer protocol.
Packet
Transport
It is the most common - and it encapsulates transport layer segments
The default gateway address is the address of a router interface that is connected to the same network as the host.

11. Which of the following are true about network layer encapsulation?
TCP
1
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.

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.
TCP
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
Upper
Data link - physical

13. 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?
Routing table
TCP uses flow control
Acknowledgment field significant
Netstat -r and route print

14. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Window size
Connectionless

15. What is a broadcast domain?
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
Ephermeral
Routing table
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

16. The three-way handshake performs what three functions?
Window size
Synchronize sequence numbers
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.
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

17. What is the port range for Registered ports
1
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
Purpose - ownership - and geographic location are key ways to divide a network
Gateway

18. Why is IP 'media independent'?
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
It works the same on all Layer 1 media
Decapsulation
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

19. 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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
FTP
Upper

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

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21. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific 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.
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

22. The three main features of routes in a routing table are?
Routers (the subnetting process)
Routing table
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Destination network - next-hop - metric

23. What is the proper order of FIN sequence?
Purpose - ownership - and geographic location are key ways to divide a network
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
UDP

24. What is the port range for dynamic or private ports
49152 - 65535.
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.
TFTP - Trivial File Transfer Protocol
53

25. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
It means ensuring that each segment that the source sends arrives at the destination
False. It's like a file - only one process can read/write.
Packet
Data link - physical

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

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27. Port 110 is?
POP3
Synchronize sequence numbers
Packet
Connectionless

28. UDP does or does not create a session?
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
All
Does not
Ephermeral

29. MSN messenger uses TCP or UDP?
DNS - video-streaming - VoIP
The source and destination port number
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP

30. Port 520 is?
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
RIP (Routing Information Protocol)
Web browsing - email - file transfer
TCP

31. Which of the following are not functions of the network layer?
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
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
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

32. Which of the following are true about IP?
HTTPS (Secure HTTP)
Destination network - next-hop - metric
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
It is the most common - and it encapsulates transport layer segments

33. 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)
Connectionless
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.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
FIN

34. Which is a connection-oriented protocol - TCP or UDP?
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
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP

35. SYN is?
Synchronize sequence numbers
20 and 8
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)

36. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
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
Reliable - connection-oriented protocol (resends if not received)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
1

37. 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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Acknowledgment field significant
53

38. Which is a connectionless protocol - UDP or TCP?
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.
Connectionless - Best effort (unreliable) - media independent
53
UDP

39. Port 69 is?
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
TFTP - Trivial File Transfer Protocol
TCP uses flow control
Reliable - connection-oriented protocol (resends if not received)

40. Port 194 is?
IRC
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Transport
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

41. On a particular network how would you determine the default gateway address for a host?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
The default gateway address is the address of a router interface that is connected to the same network as the host.
53
An alternate HTTP port

42. Which of the following is true about IP?

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43. What information does a router need to successfully forward packets?
Packet
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
Static routing

44. What does segmentation provide to communications?
DNS - video-streaming - VoIP
IRC
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TCP. It makes larger demands on a network

45. Name the private address blocks
Window size
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
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

46. IP requires that each sending and receiving device have a __________ IP address.
Unique
Not - these are done by other protocols in other layers
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
POP3

47. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Web browsing - email - file transfer
Allows the transport layer function on the destination host to reassemble segments in the right order
Upper
Connectionless - Best effort (unreliable) - media independent

48. MTU stands for ?
Upper
False. It's like a file - only one process can read/write.
TCP
Maximum transmission unit

49. How many bits are in an IPv6 address?
128
POP3
Purpose - ownership - and geographic location are key ways to divide a network
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

50. Port 23 is?
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
Telnet
Connectionless - Best effort (unreliable) - media independent