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. Why is IP 'media independent'?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
It works the same on all Layer 1 media
The default gateway address is the address of a router interface that is connected to the same network as the host.
Acknowledgment and reassembly (receipt of packets and putting them in right order)


2. The three-way handshake performs what three functions?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TCP


3. What is the protocol number for UDP?
Ephermeral
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
SMTP


4. In networking terms - What is reliability?
Acknowledgment field significant
It means ensuring that each segment that the source sends arrives at the destination
UDP
SMTP


5. 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
1
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
False. It's like a file - only one process can read/write.


6. Which of the following are true about static and dynamic routing?
Connectionless
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously


7. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
An alternate HTTP port
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)


8. ACK 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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
SMTP
Acknowledgment field significant


9. How many bytes of overhead do TCP segments carry? How many does UDP carry?
The source and destination port number
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
20 and 8
Packet


10. 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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
TCP
49152 - 65535.


11. List three network applications that use TCP
49152 - 65535.
TCP. It makes larger demands on a network
Routing table
Web browsing - email - file transfer


12. What is the netstat utility used for on a host?
Data link - physical
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
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.


13. Ephermeral port is what type of port
Dynamic / private
Netstat -r and route print
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
Transport


14. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
1
UDP
It means ensuring that each segment that the source sends arrives at the destination


15. Routers add routes for the connected networks to their ________________ .
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Routing table
TCP
Maximum transmission unit


16. Port 110 is?
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
POP3
1
Reliable - connection-oriented protocol (resends if not received)


17. Port 25 is?
The source and destination port number
Static routing
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
SMTP


18. Port 443 is?
HTTPS (Secure HTTP)
Ephermeral
Routers (the subnetting process)
SMTP


19. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
False. It's like a file - only one process can read/write.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
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


20. On a particular network how would you determine the default gateway address for a host?
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
Packet
Synchronize sequence numbers


21. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
RIP (Routing Information Protocol)
Synchronize sequence numbers
Window size


22. IP requires that each sending and receiving device have a __________ IP address.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Unique
20 and 8


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

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24. 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?
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.
Ephermeral
Static routing
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts


25. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Data link - physical
Window size
Transport
Reliable - connection-oriented protocol (resends if not received)


26. Pieces of information about a route that a routing table contains
TCP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Acknowledgment field significant
FIN


27. Encapsulation occurs at all - some or none of the layers of the OSI model?
Static routing
An alternate HTTP port
All
Ephermeral


28. MSN messenger uses TCP or UDP?
Unique
TCP
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Data link - physical


29. How does UDP keep track of sequence numbers?

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30. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Window size
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.
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


31. MTU stands for ?
The default gateway address is the address of a router interface that is connected to the same network as the host.
Maximum transmission unit
Acknowledgment field significant
It means ensuring that each segment that the source sends arrives at the destination


32. 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)
To track the different conversations crossing the network at the same time
FIN
Gateway
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation


33. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Netstat -r and route print
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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
Window size


34. Which is a connectionless protocol - UDP or TCP?
To track the different conversations crossing the network at the same time
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
49152 - 65535.
UDP


35. Which of the following is true about IP?

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36. Port 20 is?
HTTPS (Secure HTTP)
FTP
Netstat -r and route print
Data link - physical


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

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38. What is the default DNS port number?
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
53


39. Port 520 is?
The default gateway address is the address of a router interface that is connected to the same network as the host.
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent
20 and 8


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


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

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42. What is the proper order of SYN sequence?
DNS - video-streaming - VoIP
Destination network - next-hop - metric
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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.


43. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Maximum transmission unit
Gateway
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport 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.


44. Which of the following are not functions of the network layer?
TCP uses flow control
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
The source and destination port number
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.


45. What is the port range for well known ports
Telnet
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
49152 - 65535.
TCP


46. What is the port range for Registered ports
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
Web browsing - email - file transfer
Reliable - connection-oriented protocol (resends if not received)
Ephermeral


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


48. What are the transport layer's responsibilities?
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
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.
It is the most common - and it encapsulates transport layer segments
POP3


49. Name the private address blocks
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
RIP (Routing Information Protocol)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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


50. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP. It makes larger demands on a network
TCP uses flow control
Decapsulation
Allows the transport layer function on the destination host to reassemble segments in the right order