Answers please Question 12 of 40 Which network services listed use UDP? (Select

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Answers please

Question 12 of 40 Which network services listed use UDP? (Select all that apply)

1. SMTP.

2. SNMP.

3. HTTPS

4. TCP

Question 13 of 40 RIP uses what as its metric?

1. MTU 2.

Delay 3.

Bandwidth 4.

Hops.

Question 14 of 40 What is the default subnet mask for a Class A network?

1. 255.0.0.0.

2. 255.255.0.0

3. 255.255.255.0

4. 255.240.0.0

Question 15 of 40 You are assisting an application developer with filling out a load balancing request. The developer wants all http requests to be forwarded to the default https port. How would you advise the developer to fill out the request?

1. The load balancer should listen on tcp port 443 and forward to tcp port 80

2. The load balancer should listen on tcp port 80 and forward to tcp port 445

3. The load balancer should listen on tcp port 80 and forward to tcp port 443.

4. The load balancer should listen on tcp port 80 and forward to tcp port 80

Question 16 of 40 A device which forwards frames based on MAC addresses is called:

1. Router

2. Framer

3. Application gateway

4. Switch.

Question 17 of 40 What command(s) would be used to send a continuous stream of packets to a target IP address? (Select all that apply)

1. ping -t.

2. pING -l

3. ping localhost

4. netstat -ano

Question 19 of 40 OSPF uses what as its metric?

1. Hops

2. MTU

3. Delay

4. Cost.

Question 20 of 40 Your organization supports a legacy application that uses NetBIOS. Which type of server is needed to interface with this application?

1. RAS

2. DNS

3. WSUS

4. WINS .

Question 21 of 40 You have been tasked with finding the routers that have been installed between two networks. What utility would you use to provide this information? 1. Tracert.

2. ipconfig

3. route PRINT

4. route CHANGE

Question 22 of 40 Your workstation is having a TCP conversation with another node across TCP port 80. Your machine receives a TCP segment with the header checksum 0x5149. Your machine calculates the checksum for that segment as 0x6372. What will your workstation do to the TCP segment?

1. Nothing.

2. The workstation will reset the TCP connection.

3. The segment will be discarded. .

4. Your machine will drop the connection to the opposite server and not reestablish communication with it.

Question 23 of 40 What is the protocol data unit called for layer 2 in the OSI model?

1. Packet

2. Frame .

3. Segment

4. Bit

Explanation / Answer

12. SNMP(Simple Network Management Protocol):-

SNMP uses UDP because UDP is connectionless protocol. As SNMP does not require reliability so UDP is preferred over TCP protocol. SNMP was designed to be used as a request/response protocol and UDP is a simple protocol to work upon SNMP.

13. Hops:-

RIP(Routing information protocol) uses hops as its metric. Hop count is the number of routers from source network to destination network. RIP selects the best path to a destination network based only on the number of hops to the destination network.

14. 255.0.0.0 :-

The first bit of the first octet is always set to 0. Thus the first octet ranges from 1 – 127. The default subnet mask for class A is 255.0.0.0. which implies that Class A addressing can have 126 networks (2^7-2) and 16777214 hosts.

15. The load balancer should listen on tcp port 80 and forward to tcp port 443:-

Because it provides an effective way to ensure that all traffic to and from the IBM HTTP Server is encrypted over the Secure Sockets Layer (SSL) without having to use
individual redirects or hard-coded HTTPS links.

16. Switch:-
When host A trying to communicate with Host B i.e. want to send a packet then a packet arrives at the switch which searches for MAC Address. If the MAC address is found then, switch forwards frames to the port that connected to the frame's destination.

17. ping-t:-

This command specifies that ping-t continue sending echo request messages to the destination until interrupted.

19. Cost:-
OSPF(Open shortest path first) uses the cost metric that is based on the bandwidth, used to select the best route. OSPF also uses cost metric to judge a path's feasibility.

20. WINS(Windows Internet Naming Service):-

WINS will be used to interface legacy application because it enables computers to register and resolve Network Basic Input/Output System (NetBIOS) names on Internet Protocol version 4 (IPv4) networks.

21. Tracert(TraceRoute):-
Traceroute is a utility that records the route through the Internet between computer and a specified destination computer.

22. The segment will be discarded:-

Checksums are used to handle errors. The checksum received by TCP connection does not match with the checksum generated. So, at this point the segment will be discarded.

23. Frame:-

Each layer in the model uses PDU(protocol data unit) to communicate and exchange information. In layer 2( Data link layer), PDU is frame. The data link layer is concerned with local delivery of frames between devices on the same LAN(Local Area Network).

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