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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. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Routers (the subnetting process)
FTP
Reliable - connection-oriented protocol (resends if not received)

2. Ephermeral port is what type of port
It works the same on all Layer 1 media
TCP
Dynamic / private
TCP uses flow control

3. What is the port range for Registered ports
TFTP - Trivial File Transfer Protocol
Maximum transmission unit
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

4. The three-way handshake performs what three functions?
It means ensuring that each segment that the source sends arrives at the destination
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
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

5. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Purpose - ownership - and geographic location are key ways to divide a network

6. What is the proper order of SYN sequence?
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.
Gateway
RIP (Routing Information Protocol)

7. Which of the following is true about IP?

8. What information does a router need to successfully forward packets?
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
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.
128

9. What is the netstat utility used for on a host?
FTP
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

10. Which of the following are not functions of the network layer?
User Datagram 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
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
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

11. 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?
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
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Static routing

12. List three network applications that use UDP
DNS - video-streaming - VoIP
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.
Allows the transport layer function on the destination host to reassemble segments in the right order
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. UDP does or does not create a session?
To track the different conversations crossing the network at the same time
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
Does not
Window size

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

15. What is the proper order of FIN sequence?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
The default gateway address is the address of a router interface that is connected to the same network as the host.
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
It means ensuring that each segment that the source sends arrives at the destination

16. Port 23 is?
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
Web browsing - email - file transfer
Telnet

17. What two commands can be used to view a host's routing table?
Allows the transport layer function on the destination host to reassemble segments in the right order
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
49152 - 65535.
Netstat -r and route print

18. Port 443 is?
Synchronize sequence numbers
Forward the packet to the default route interface (gateway) or just drop/discard the packets
TCP. It makes larger demands on a network
HTTPS (Secure HTTP)

19. During data transfer - What is the receiving host responsible for?
1
TCP. It makes larger demands on a network
Acknowledgment and reassembly (receipt of packets and putting them in right order)
UDP

20. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
TFTP - Trivial File Transfer Protocol
Destination network - next-hop - metric
1

21. What does segmentation provide to communications?
Synchronize sequence numbers
It Doesn't - TCP does
To track the different conversations crossing the network at the same time
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

22. What is contained in the header of each segment or datagram?
The source and destination port number
All
User Datagram Protocol
An alternate HTTP port

23. Which of the following are true about IP?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It is the most common - and it encapsulates transport layer segments
RIP (Routing Information Protocol)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

24. MSN messenger uses TCP or UDP?
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
UDP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

25. 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.
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
Data link - physical
An alternate HTTP port
It works the same on all Layer 1 media

26. 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
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
Static routing
To track the different conversations crossing the network at the same time

27. 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.
UDP
49152 - 65535.
Forward the packet to the default route interface (gateway) or just drop/discard the packets

28. How many bits are in an IPv4 address?
Does not
Telnet
UDP - it sends datagrams as 'best effort'
32 - there are four octets of 8 bits each in an IPv4 address

29. Which of the following are true about network layer encapsulation?
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
Packet
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.
DNS - video-streaming - VoIP

30. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
TCP
Unique
Upper
It is the most common - and it encapsulates transport layer segments

31. Pieces of information about a route that a routing table contains
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
Reliable - connection-oriented protocol (resends if not received)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
RIP (Routing Information Protocol)

32. Routers add routes for the connected networks to their ________________ .
Purpose - ownership - and geographic location are key ways to divide a network
Static routing
Routing table
To track the different conversations crossing the network at the same time

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

34. 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?
DNS - video-streaming - VoIP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

35. Port 110 is?
POP3
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Data link - physical

36. Name the private address blocks
32 - there are four octets of 8 bits each in an IPv4 address
False. It's like a file - only one process can read/write.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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

37. TCP header provides for
53
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Static routing
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

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

39. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP uses flow control
User Datagram Protocol
Acknowledgment field significant

40. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
It means ensuring that each segment that the source sends arrives at the destination
128

41. Port 194 is?
UDP
Dynamic / private
Connectionless
IRC

42. What are three key factors to consider when grouping hosts into a common network?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

43. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Routing table
RIP (Routing Information Protocol)
1
TCP

44. How many bits are in an IPv6 address?
128
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Unique
SMTP

45. Port 8080 is?
IRC
Acknowledgment field significant
An alternate HTTP port
53

46. Which is a connectionless protocol - UDP or TCP?
The default gateway address is the address of a router interface that is connected to the same network as the host.
UDP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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

47. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Web browsing - email - file transfer
IRC

48. Port 520 is?
RIP (Routing Information Protocol)
Web browsing - email - file transfer
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Data link - physical

49. How many bytes of overhead do TCP segments carry? How many does UDP carry?
UDP
20 and 8
Window size
Synchronize sequence numbers

50. On a particular network how would you determine the default gateway address for a host?
The source and destination port number
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
TFTP - Trivial File Transfer Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.