Network Data Related Question


JUNIPER SCREENOS

Q.1      What are the series of ScreenOS boxes? 
Q.2      What is the latest version ScreenOS? 
Q.3      Juniper Packet Flow. 
Q.4      What is Screen Check? How to configure Screen Check in Juniper? 
Q.5      What is DIP, MIP and VIP? 
Q.6      How to configure Cluster in Juniper? 




ROUTING

Q.1      Difference between Static and Dynamic Routing?
Q.2     Different between AD Value and Metric? And what is the AD value of EIGRP,  OSPF, RIP and BGP?
Ans.   

AD: - The administrative distance is helpful to select best between two or more routing Protocols. For example best route selection between OSPF and RIP.

Metric: - Metrics are only helpful to select route inside a routing protocol. For example best route inside the RIP. 

Administrative Distance Valuse
            Connected Interface = 0
            Static Route =  1
            EIGRP Summery Route = 5
            External BGP = 20
            Internal EIGRP = 90
            IGRP = 100
            OSPF = 110
            IS-IS = 115
            RIP = 120
            EGP = 140
            On Demand Routing = 160
            External EIGRP = 170
            Internal BGP = 200
            Unknown = 255
Q.3      How to configure Inter-VLAN routing in router?
Q.4      How to enable trunking in router?




SWITCHING 

Q.1      What is Private VLAN? What is extended or High VLAN range? 
Q.2      What is Native VLAN? 
Q.3      What is VTP? 
Q.4    What is Transparent Mode in VTP and how it works? If we create new VLAN on Transparent Switch that will be advertise or not? 
Q.5      What is 802.1x standard?   


PROTOCOLS




Q.1      What are different ports of FTP? What is the use of FTP different ports? 

Ans.    A Client makes a TCP connection to the server port 21. This connection remains open for the duration of the session and thus it is called a control session. Then another connection is opened on Port 20 and it is called the data connection. The control connection is used for authenticating, command and administrating exchanged between the client and the server.



Q.2      What are the modes of FTP? 

Ans.    There are two types of FTP.



Passive FTP: - In passive mode, the client establishes both channels (Data and control). In that case, the server tells the client which port should be used for the data channel.



Active FTP: - In active mode, the client establishes the control channel but the server establishes the data channel.



Q.3      Why FTP does not work with Packet Filter Firewall? 

Q.4      What are the ports of DNS?
Ans.     DNS use Port TCP & UDP 53.

Q.5      When DNS use port tcp_53? 
Ans.   UDP/53 is used when a host or a router wants to resolve a domain name to an IP address (or vice versa).


          TCP/53 is used between two DNS servers when they want to sync or share their databases. Or If the size of the response message is more than 512 bytes, a TCP connection is used.

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