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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. Which of the following are true about IP?
POP3
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It is the most common - and it encapsulates transport layer segments
Acknowledgment field significant

2. How does UDP keep track of sequence numbers?

3. Port 8080 is?
RIP (Routing Information Protocol)
Web browsing - email - file transfer
An alternate HTTP port
TCP uses flow control

4. TCP is a ________________ layer protocol.
Transport
Unique
Window size
Upper

5. 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?
Connectionless - Best effort (unreliable) - 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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
False. It's like a file - only one process can read/write.

6. Port 25 is?
TFTP - Trivial File Transfer Protocol
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
POP3
SMTP

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

8. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
DNS - video-streaming - VoIP
TCP. It makes larger demands on a network
Destination network - next-hop - metric

9. 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?
IRC
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
Netstat -r and route print

10. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
TCP uses flow control
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
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

11. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
It works the same on all Layer 1 media
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
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
Packet

12. Which is a connection-oriented protocol - TCP or UDP?
TCP
49152 - 65535.
An alternate HTTP 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

13. 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.
Upper
UDP
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

14. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Does not
Connectionless

15. List three network applications that use TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Web browsing - email - file transfer
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

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

17. During data transfer - What is the receiving host responsible for?
Maximum transmission unit
Window size
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Upper

18. What are the three basic characteristics of IPv4?
53
Web browsing - email - file transfer
1
Connectionless - Best effort (unreliable) - media independent

19. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
Connectionless - Best effort (unreliable) - media independent
Acknowledgment and reassembly (receipt of packets and putting them in right order)
TCP uses flow control

20. The three main features of routes in a routing table are?
Dynamic / private
Gateway
Destination network - next-hop - metric
TCP

21. What information does a router need to successfully forward 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
Not - these are done by other protocols in other layers
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets

22. 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.
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.
RIP (Routing Information Protocol)
Static routing

23. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
It is the most common - and it encapsulates transport layer segments
Ephermeral

24. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
20 and 8
Routers (the subnetting process)
Packet

25. What is the port range for Registered ports
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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
32 - there are four octets of 8 bits each in an IPv4 address
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

26. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reliable - connection-oriented protocol (resends if not received)
Does not
Unique

27. How many bits are in an IPv6 address?
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
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
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.
128

28. Routers add routes for the connected networks to their ________________ .
Telnet
User Datagram Protocol
Routing table
The default gateway address is the address of a router interface that is connected to the same network as the host.

29. On a particular network how would you determine the default gateway address for a host?
TCP. It makes larger demands on a network
Allows the transport layer function on the destination host to reassemble segments in the right order
Transport
The default gateway address is the address of a router interface that is connected to the same network as the host.

30. 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?
FTP
All
Purpose - ownership - and geographic location are key ways to divide a network
TCP uses flow control

31. What does segmentation provide to communications?
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 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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

32. Port 23 is?
Telnet
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Synchronize sequence numbers
Web browsing - email - file transfer

33. 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
False. It's like a file - only one process can read/write.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

34. What is the purpose of TCP/UDP port numbers?
Upper
Connectionless
Telnet
To track the different conversations crossing the network at the same time

35. Which of the following is true about IP?

36. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
RIP (Routing Information 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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

37. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Purpose - ownership - and geographic location are key ways to divide a network
Window size
Gateway
POP3

38. Which is a connectionless protocol - UDP or TCP?
Decapsulation
Destination network - next-hop - metric
POP3
UDP

39. What is the proper order of FIN sequence?
It means ensuring that each segment that the source sends arrives at the destination
HTTPS (Secure HTTP)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
UDP

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

41. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Synchronize sequence numbers
Forward the packet to the default route interface (gateway) or just drop/discard the packets
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

42. What is the netstat utility used for on a host?
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
Allows the transport layer function on the destination host to reassemble segments in the right order
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

43. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
RIP (Routing Information Protocol)
1
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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

44. Port 69 is?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
TFTP - Trivial File Transfer Protocol
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

45. Why does TCP use a sequence number in the header?
All
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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

46. Name the private address blocks
Transport
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
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

47. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
Decapsulation
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Connectionless - Best effort (unreliable) - media independent

48. Pieces of information about a route that a routing table contains
POP3
Dynamic / private
Unique
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

49. 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
Upper
User Datagram Protocol
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

50. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
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
FTP
Packet