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 8080 is?
Decapsulation
Window size
An alternate HTTP port
128


2. How many bits are in an IPv4 address?
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
It works the same on all Layer 1 media
Maximum transmission unit
32 - there are four octets of 8 bits each in an IPv4 address


3. What information does a router need to successfully forward packets?
Ephermeral
Transport
TCP
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


4. Routers add routes for the connected networks to their ________________ .
Routing table
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Dynamic / private
128


5. List three network applications that use TCP
TCP uses flow control
Web browsing - email - file transfer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses


6. Why is IP 'media independent'?
53
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
It works the same on all Layer 1 media
Gateway


7. Ephermeral port is what type of 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.
1
Dynamic / private
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


8. Port 110 is?
TCP
POP3
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)


9. Port 25 is?
SMTP
IRC
Data link - physical
The source and destination port number


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


11. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
Routing table
Maximum transmission unit
FIN


12. 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
TCP
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.
TCP uses flow control


13. IP is designed or not designed to track and manage the flow of packets?
DNS - video-streaming - VoIP
Not - these are done by other protocols in other layers
HTTPS (Secure HTTP)
Destination network - next-hop - metric


14. IP requires that each sending and receiving device have a __________ IP address.
Unique
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
Synchronize sequence numbers
Packet


15. Which protocol ensures more reliable delivery between applications - TCP or UDP?
32 - there are four octets of 8 bits each in an IPv4 address
TCP. It makes larger demands on a network
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
1


16. Port 23 is?
TFTP - Trivial File Transfer Protocol
Web browsing - email - file transfer
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Telnet


17. MTU stands for ?
Maximum transmission unit
UDP - it sends datagrams as 'best effort'
DNS - video-streaming - VoIP
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


18. Port 443 is?
False. It's like a file - only one process can read/write.
User Datagram Protocol
HTTPS (Secure HTTP)
RIP (Routing Information Protocol)


19. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Destination network - next-hop - metric


20. MSN messenger uses TCP or UDP?
Gateway
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP
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


21. What is the purpose of TCP/UDP port numbers?
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 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.
To track the different conversations crossing the network at the same time
It means ensuring that each segment that the source sends arrives at the destination


22. What is the purpose of the ToS field in the IPv4 header?
Transport
FIN
Routers (the subnetting process)
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.


23. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
It is the most common - and it encapsulates transport layer segments
Web browsing - email - file transfer
Ephermeral


24. 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)
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.
FIN
Telnet
Forward the packet to the default route interface (gateway) or just drop/discard the packets


25. UDP does or does not create a session?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Does not
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 routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously


26. The three-way handshake performs what three functions?
Maximum transmission unit
TFTP - Trivial File Transfer Protocol
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
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


27. 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?
TCP uses flow control
RIP (Routing Information Protocol)
TCP
Forward the packet to the default route interface (gateway) or just drop/discard the packets


28. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Telnet
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Synchronize sequence numbers
Data link - physical


29. Which of the following are true about IP?
Upper
TCP uses flow control
It is the most common - and it encapsulates transport layer segments
Window size


30. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Routers (the subnetting process)
Not - these are done by other protocols in other layers
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Allows the transport layer function on the destination host to reassemble segments in the right order


31. Port 520 is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
TCP
Does not
RIP (Routing Information Protocol)


32. What two commands can be used to view a host's routing table?
Connectionless - Best effort (unreliable) - media independent
Acknowledgment field significant
Netstat -r and route print
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.


33. SYN is?
TFTP - Trivial File Transfer Protocol
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
Web browsing - email - file transfer
Synchronize sequence numbers


34. List three network applications that use UDP
DNS - video-streaming - VoIP
Dynamic / private
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.
1


35. What four tasks does the network layer perform?
Packet
Synchronize sequence numbers
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation


36. What is the protocol number for UDP?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
False. It's like a file - only one process can read/write.
An alternate HTTP port
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)


37. What is the default DNS port number?
Allows the transport layer function on the destination host to reassemble segments in the right order
FIN
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


38. Why does TCP use a sequence number in the header?
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
Purpose - ownership - and geographic location are key ways to divide 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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.


39. UDP stands for?
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
UDP
User Datagram Protocol


40. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
IRC
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
To track the different conversations crossing the network at the same time


41. TCP is a ________________ layer protocol.
Acknowledgment field significant
Unique
Transport
Forward the packet to the default route interface (gateway) or just drop/discard the packets


42. 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.
DNS - video-streaming - VoIP
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
Static routing


43. What is the port range for Registered ports
Ephermeral
49152 - 65535.
Decapsulation
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


44. Are well known ports registered
FTP
53
Connectionless
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.


45. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
Connectionless - Best effort (unreliable) - media independent
Acknowledgment and reassembly (receipt of packets and putting them in right order)
POP3


46. Which is a connectionless protocol - UDP or TCP?
Gateway
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
UDP


47. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Window size
Packet
Gateway
TCP


48. Port 69 is?
TCP
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
RIP (Routing Information Protocol)
TFTP - Trivial File Transfer Protocol


49. Encapsulation occurs at all - some or none of the layers of the OSI model?
It means ensuring that each segment that the source sends arrives at the destination
FTP
All
1


50. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Not - these are done by other protocols in other layers
Synchronize sequence numbers
Window size
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