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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. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Window size
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

2. MTU stands for ?
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
TCP. It makes larger demands on a network
Maximum transmission unit
TCP

3. Why is IP 'media independent'?
Gateway
It works the same on all Layer 1 media
Reliable - connection-oriented protocol (resends if not received)
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

4. UDP stands for?
Static routing
User Datagram Protocol
It is the most common - and it encapsulates transport layer segments
It means ensuring that each segment that the source sends arrives at the destination

5. In networking terms - What is reliability?
TCP
It means ensuring that each segment that the source sends arrives at the destination
The source and destination port number
Gateway

6. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
Not - these are done by other protocols in other layers
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
Unique

7. The three main features of routes in a routing table are?
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.
Destination network - next-hop - metric
It Doesn't - TCP does
UDP

8. What are the transport layer's responsibilities?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
User Datagram Protocol

9. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
All
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
Transport
Reliable - connection-oriented protocol (resends if not received)

10. 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
53
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

11. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
128
Connectionless
1

12. Port 443 is?
Packet
The source and destination port number
HTTPS (Secure HTTP)
Decapsulation

13. Routers add routes for the connected networks to their ________________ .
Routing table
Packet
TCP
It means ensuring that each segment that the source sends arrives at the destination

14. Port 520 is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
RIP (Routing Information Protocol)
Allows the transport layer function on the destination host to reassemble segments in the right order
The default gateway address is the address of a router interface that is connected to the same network as the host.

15. What two commands can be used to view a host's routing table?
Netstat -r and route print
Maximum transmission unit
It Doesn't - TCP does
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

16. Pieces of information about a route that a routing table contains
Upper
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
False. It's like a file - only one process can read/write.
UDP - it sends datagrams as 'best effort'

17. What is the default DNS port number?
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
POP3
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.
53

18. Which is a connectionless protocol - UDP or TCP?
Static routing
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
UDP
20 and 8

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

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20. Which of the following are not functions of the network layer?
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.
All
Does not

21. 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
FTP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP

22. Which of the following are true about IP?
Web browsing - email - file transfer
TCP
It is the most common - and it encapsulates transport layer segments
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

23. Ephermeral port is what type of port
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic / private
RIP (Routing Information Protocol)
Telnet

24. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Synchronize sequence numbers
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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.

25. What are three key factors to consider when grouping hosts into a common network?
Purpose - ownership - and geographic location are key ways to divide a network
HTTPS (Secure HTTP)
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Unique

26. What information does a router need to successfully forward packets?
Packet
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
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

27. Port 20 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
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.
FTP
Destination network - next-hop - metric

28. MSN messenger uses TCP or UDP?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Routers (the subnetting process)
Connectionless
TCP

29. 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
Decapsulation
TCP. It makes larger demands on a network
An alternate HTTP port

30. Which of the following are true about network layer encapsulation?
Purpose - ownership - and geographic location are key ways to divide a network
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.
UDP - it sends datagrams as 'best effort'
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.

31. What four tasks does the network layer perform?
Ephermeral
Static routing
TCP. It makes larger demands on a network
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

32. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Transport
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
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.

33. Port 69 is?
HTTPS (Secure HTTP)
TFTP - Trivial File Transfer Protocol
Web browsing - email - file transfer
The source and destination port number

34. What is the proper order of FIN sequence?
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)
POP3
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.

35. List three network applications that use TCP
Web browsing - email - file transfer
RIP (Routing Information Protocol)
Unique
Synchronize sequence numbers

36. Encapsulation occurs at all - some or none of the layers of the OSI model?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
1
All
DNS - video-streaming - VoIP

37. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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
1
Routers (the subnetting process)

38. What is the purpose of sequence numbers?
Maximum transmission unit
Dynamic / private
Allows the transport layer function on the destination host to reassemble segments in the right order
All

39. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Maximum transmission unit
Dynamic / private
POP3

40. What is a broadcast domain?
Data link - physical
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.
TCP
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

41. What is the port range for well known ports
TFTP - Trivial File Transfer Protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
Upper
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

42. Port 194 is?
IRC
TCP
Allows the transport layer function on the destination host to reassemble segments in the right order
SMTP

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

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44. ACK is?
Dynamic / private
20 and 8
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Acknowledgment field significant

45. How many bytes of overhead do TCP segments carry? How many does UDP carry?
SMTP
All
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
20 and 8

46. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Purpose - ownership - and geographic location are key ways to divide a network
TCP uses flow control
UDP - it sends datagrams as 'best effort'
Forward the packet to the default route interface (gateway) or just drop/discard the packets

47. During data transfer - What is the receiving host responsible for?
Connectionless - Best effort (unreliable) - media independent
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
TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

48. List three network applications that use UDP
Reliable - connection-oriented protocol (resends if not received)
DNS - video-streaming - VoIP
TCP uses flow control
49152 - 65535.

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)
Packet
FIN
An alternate HTTP port
UDP - it sends datagrams as 'best effort'

50. How many bits are in an IPv6 address?
Dynamic / private
DNS - video-streaming - VoIP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
128