Network and Security interview questions (Cisco)

Cisco Firewall


0.What is Stateful Inspection & Packet Filtering.Whats the difference ?
1.What is Adaptive Security Algorithm?
2.what are the default security levels for interfaces in firewall?
2.How would the firewall treat a TCP and UDP packets when it crosses the firewall ?
3.Tell me abt the different types of NAT?
3.What is the order of NAT ?
4.what is NAT Control ?
5.What are the troubleshooting mechanism to be followed in Cisco Firewalls?
a) different flow lookups in the output of Packet Tracer?
6.What is Stateful Failover ? (command to enable failover)
7.what is Transparent Firewall ?
8.how to check the the connections and NAT Translations?
9.How would you trouble shoot the high utilization issue in firewall ?
10.one of the best issues u have troubleshooted with firewall ?
11.Diff between a IPS & Firewall ?


VPN


1.What is Site-Site and Remote Access VPN?
2.What is phase 1 tunnel and the paramters involved ?
3.What is phase 2 tunnel and the paramters involved ?
4.What is PFS ?
5.Why would a DH is required ?
6.How to check the status of the tunnel in phase 1 & 2 ?
7.what are the commands required to troubleshoot VPN?
8.what is GRE and why its required?
9.How can we carry routing updates via IPSEC without GRE?
10.What is NAT Traversal?
11.What are the ports involved in NAT Traversal ?


General


1.Diff between TCP & UDP?
2.What is ARP & RARP?
3.Firewall works at what Layer?
4.What is DNS doctoring?
5.What is proxy & Gratituous ARP?
6.Active & Passive FTP?
7.What is DHCP relay agent ? if DHCP server locates in a different subnet , how would the process works?
8 What is MTU and fragmentation ?
9.What is DoS Attack , Spoofing attack ? how can be Prevented?




Routing


1.What is Subneting and Superneting ?
2.What is Static Route and a Default Route ?
3.What is Classful and Class less Routing
4.what is Dynamic Routing? 


A)OSPF

1.Metric Used for OSPF?
2.What are the Parameters required for OSPF neighbourship?
3.What is NSSA , stubby ,total stubby ?
4.How would the cost of the interfaces is calculated?
5.Commands to view the OSPF neighbour?


B)EIGRP


1.Metric for EIGRP and its AD ?
2.What is stuck in active?
3.How would the un equal load balancing works with EIGRP?
4.diff between EIGRP and OSPF ?
5.Commands to view the eigrp neighbour ?


C)BGP


1.What is IBGP and EBGP ?
2.What is LOcal prefernce and MED?
3.What is BGP synchronization ?
4.what is AD of IBG and EBGP?
5.we have two entries in the routing table , say for an example


192.168.1.0 /24 --> 1.1.1.1
192.168.1.128/25 --->2.2.2.2


what is the next hop to reach 192.168.1.200 ?


6.Why is Redistribution required?
7.How would you filter the routes being Redistributed?


Cisco IPS


1.What is IPS and IDS .Tell me the difference between them ?
2.What are the IPS modules you have worked?
3.What is AIP-SSM?
4.What is Promiscuous and Inline Mode?
5.What is a Signature ?Tell me some signature engines?
6.How would you implement an IPS in a Network?
7.How would you manage IPS?
8.What is False Positive and False Negative?
9.What are the event action involved in Inline Mode?