Job Description: Firewall Engineer provides cybersecurity guidance on the implementation and maintenance of network technologies including but not limited to: Firewall, IPS/IDS, NAC, and PKI. 

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Top 100 Supply Chain Interview Questions for Routing and Switching with Firewall Or Loadbalancer    

1. Can you explain the difference between a router and a switch? 
2. What is VLAN and how does it work? 
3. How do you configure OSPF routing protocol? 
4. What is NAT and how does it work? 
5. Can you describe the role of a firewall in network security? 
6. What are the common types of firewall architectures? 
7. How do you configure access control lists (ACLs) on a firewall? 
8. What is a load balancer and how does it improve network performance? 
9. Can you explain the difference between a hardware load balancer and a software load balancer? 
10. How do you troubleshoot network congestion issues? 
11. What steps would you take to secure a network against DDoS attacks? 
12. What are some common security threats to network infrastructure? 
13. How do you ensure high availability in a network environment? 
14. Can you describe the process of setting up a site-to-site VPN? 
15. What is SSL decryption and why is it important for network security? 
16. How do you monitor network traffic for potential security threats? 
17. What tools do you use for network performance monitoring and troubleshooting? 
18. Can you discuss your experience with network segmentation and its benefits? 
19. How do you implement redundancy in network design? 
20. Can you provide an example of a challenging network issue you resolved in the past?  
21. How do you configure port security on a switch? 
22. What is the purpose of STP (Spanning Tree Protocol)? 
23. Can you explain the concept of EtherChannel and its benefits? 
24. What is the role of ARP (Address Resolution Protocol) in networking? 
25. How do you troubleshoot network connectivity issues? 
26. Can you describe the OSI model and its layers? 
27. What is the difference between TCP and UDP? 
28. How do you configure a static route on a router? 
29. What is the purpose of ACL (Access Control List) in network security? 
30. Can you discuss the differences between stateful and stateless firewalls? 
31. How do you configure NAT (Network Address Translation) on a firewall? 
32. What is DMZ (Demilitarized Zone) and why is it used in network architecture? 
33. Can you explain the concept of VPN (Virtual Private Network) and its advantages? 
34. How do you configure IPSec VPN on a firewall? 
35. What is SSL VPN and how does it work? 
36. Can you discuss the advantages and disadvantages of using Layer 2 vs. Layer 3 switches? 
37. How do you troubleshoot a slow network connection? 
38. What is the purpose of QoS (Quality of Service) in networking? 
39. How do you configure QoS on a router or switch? 
40. Can you explain the difference between load balancing and failover? 
41. How do you perform network performance testing and optimization? 
42. Can you describe your experience with network capacity planning? 
43. What are the benefits of using VLAN trunking protocols like 802.1Q? 
44. How do you configure VLAN trunking on a switch? 
45. Can you discuss the advantages and disadvantages of using dynamic routing protocols? 
46. How do you configure OSPF authentication? 
47. What is the role of BGP (Border Gateway Protocol) in internet routing? 
48. How do you troubleshoot BGP routing issues? 
49. Can you explain the concept of route redistribution? 
50. What is VRRP (Virtual Router Redundancy Protocol) and how does it work? 
51. How do you configure VRRP on routers? 
52. What is HSRP (Hot Standby Router Protocol) and how does it differ from VRRP? 
53. Can you discuss your experience with configuring IPsec VPN tunnels? 
54. What are some common security best practices for configuring firewalls? 
55. How do you implement Intrusion Detection Systems (IDS) on a network? 
56. Can you explain the concept of NAT overload (PAT)? 
57. How do you configure NAT overload on a router? 
58. What is the purpose of an SSL certificate in network security? 
59. How do you perform vulnerability assessments on network devices? 
60. Can you discuss your experience with configuring network logging and monitoring? 
61. What steps would you take to secure SNMP (Simple Network Management Protocol)? 
62. How do you configure SNMP traps on network devices? 
63. Can you explain the concept of ARP poisoning and its impact on network security? 
64. How do you mitigate ARP poisoning attacks? 
65. What are some common symptoms of a network intrusion? 
66. How do you detect and mitigate DDoS attacks on a network? 
67. Can you discuss your experience with configuring VLANs in a network environment? 
68. How do you troubleshoot VLAN configuration issues? 
69. What is the purpose of STP root bridge in a switched network? 
70. How do you configure STP priorities on switches? 
71. What is the difference between layer 2 and layer 3 switches? 
72. How do you configure port security on Cisco switches? 
73. What are the benefits of using VLANs in a network? 
74. Can you discuss your experience with configuring VLAN trunks? 
75. How do you troubleshoot VLAN connectivity issues? 
76. What are the advantages of using dynamic routing protocols? 
77. How do you configure OSPF routing protocol on Cisco routers? 
78. What are the benefits of using access control lists (ACLs) on routers? 
79. How do you configure ACLs to control traffic on Cisco routers? 
80. Can you discuss your experience with configuring NAT (Network Address Translation) on Cisco routers?  
81. Can you explain the purpose of routing in a network? 
82. What is the difference between static routing and dynamic routing? 
83. How do you troubleshoot a router that is not forwarding traffic? 
84. Can you describe the role of ARP (Address Resolution Protocol) in routing? 
85. What is the function of a default route on a router? 
86. How do you configure access control lists (ACLs) on a router? 
87. Can you explain the concept of NAT (Network Address Translation) and its benefits? 
88. What are the different types of NAT? 
89. How do you configure port forwarding on a firewall? 
90. What is the purpose of a load balancer in a network architecture? 
91. Can you discuss the difference between Layer 4 and Layer 7 load balancing? 
92. How do you troubleshoot load balancer performance issues? 
93. What security features are commonly found in firewalls? 
94. How do you configure firewall rules to allow specific traffic? 
95. Can you explain the concept of VPN (Virtual Private Network) tunneling through a firewall? 
96. What are some common methods for preventing DDoS attacks on a network? 
97. How do you configure VLANs (Virtual Local Area Networks) on a switch? 
98. What is the purpose of VLAN trunking? 
99. How do you troubleshoot VLAN connectivity issues? 
100. Can you discuss the benefits of using redundant links in a network design?             

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