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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 520 is?
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
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.
RIP (Routing Information Protocol)
Decapsulation

2. Routers add routes for the connected networks to their ________________ .
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Routing table

3. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Telnet
32 - there are four octets of 8 bits each in an IPv4 address
All
Gateway

4. Port 69 is?
TCP
Not - these are done by other protocols in other layers
TFTP - Trivial File Transfer Protocol
49152 - 65535.

5. Which of the following are true about IP?
Does not
UDP
Connectionless - Best effort (unreliable) - media independent
It is the most common - and it encapsulates transport layer segments

6. Which of the following is true about IP?

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7. The three main features of routes in a routing table are?
Destination network - next-hop - metric
Netstat -r and route print
Web browsing - email - file transfer
It means ensuring that each segment that the source sends arrives at the destination

8. Which is a connectionless protocol - UDP or TCP?
UDP
20 and 8
It means ensuring that each segment that the source sends arrives at the destination
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

9. MTU stands for ?
Maximum transmission unit
Packet
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
TCP. It makes larger demands on a network

10. What four tasks does the network layer perform?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

11. What is the purpose of TCP/UDP port numbers?
RIP (Routing Information Protocol)
To track the different conversations crossing the network at the same time
Telnet
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

12. Ephermeral port is what type of port
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
HTTPS (Secure HTTP)
It Doesn't - TCP does
Dynamic / private

13. What is the netstat utility used for on a host?
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.
TCP uses flow control
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.

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

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15. 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
Netstat -r and route print
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
UDP

16. In networking terms - What is reliability?
Routing table
It means ensuring that each segment that the source sends arrives at the destination
Web browsing - email - file transfer
32 - there are four octets of 8 bits each in an IPv4 address

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

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18. IP requires that each sending and receiving device have a __________ IP address.
Unique
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
53
It means ensuring that each segment that the source sends arrives at the destination

19. Which is a connection-oriented protocol - TCP or UDP?
TCP
Not - these are done by other protocols in other layers
RIP (Routing Information Protocol)
It is the most common - and it encapsulates transport layer segments

20. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Decapsulation
TCP. It makes larger demands on a network
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
1

21. The three-way handshake performs what three functions?
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
DNS - video-streaming - VoIP
Telnet
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

22. Why does TCP use a sequence number in the header?
Ephermeral
Gateway
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

23. What is the port range for Registered ports
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
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

24. Why is IP 'media independent'?
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 network - next-hop - metric
It works the same on all Layer 1 media
Synchronize sequence numbers

25. What are the transport layer's responsibilities?
TCP. It makes larger demands on a network
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
Does not
Acknowledgment field significant

26. How many bits are in an IPv6 address?
Web browsing - email - file transfer
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
128

27. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Decapsulation
49152 - 65535.
An alternate HTTP port
Connectionless

28. Encapsulation occurs at all - some or none of the layers of the OSI model?
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
Connectionless
TFTP - Trivial File Transfer Protocol

29. ACK is?
Not - these are done by other protocols in other layers
Acknowledgment field significant
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

30. 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.
Telnet
Data link - physical
It works the same on all Layer 1 media
Maximum transmission unit

31. IP is designed or not designed to track and manage the flow of packets?
Packet
To track the different conversations crossing the network at the same time
Not - these are done by other protocols in other layers
53

32. Port 20 is?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
53
FTP
POP3

33. Port 8080 is?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Synchronize sequence numbers
Static routing
An alternate HTTP port

34. What information does a router need to successfully forward packets?
Decapsulation
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
Does not

35. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
It works the same on all Layer 1 media
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Window size
HTTPS (Secure HTTP)

36. What is the purpose of the ToS field in the IPv4 header?
UDP
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.
Dynamic / private

37. Which protocol ensures more reliable delivery between applications - TCP or UDP?
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
TCP. It makes larger demands on a network
Routing table
All

38. During data transfer - What is the receiving host responsible for?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It works the same on all Layer 1 media

39. What is the port range for well known 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
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
IRC

40. What two commands can be used to view a host's routing table?
Synchronize sequence numbers
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
TCP
Netstat -r and route print

41. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
49152 - 65535.
Routers (the subnetting process)
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)

42. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
TFTP - Trivial File Transfer Protocol
FTP
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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

43. MSN messenger uses TCP or UDP?
SMTP
Reliable - connection-oriented protocol (resends if not received)
TCP
IRC

44. What is the proper order of SYN sequence?
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 #
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless - Best effort (unreliable) - media independent

45. What is contained in the header of each segment or datagram?
Ephermeral
Transport
It works the same on all Layer 1 media
The source and destination port number

46. SYN is?
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
HTTPS (Secure HTTP)
Synchronize sequence numbers
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

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

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48. What is a broadcast domain?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper
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

49. 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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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.

50. Are well known ports registered
The source and destination port number
49152 - 65535.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Packet