MCQs

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1. What is asymmetric routing in networking?
   a. Routing where outgoing and return traffic follow different paths
   b. Routing where outgoing and return traffic follow the same path
   c. Routing only for multicast traffic
   d. Routing based on protocol type
   Answer: anoction+2
2. Which scenario commonly leads to asymmetric routing?
   a. Single uplink networks
   b. Networks with multiple ISPs
   c. Hub-and-spoke topologies only
   d. Static routing on a standalone router
   Answer: blearn.microsoft+2
3. Which of the following can complicate network security monitoring due to asymmetric routing?
   a. Stateless firewalls
   b. Layer 2 switches
   c. Stateful firewalls
   d. Network hubs
   Answer: ccisco+1
4. What is a potential drawback of asymmetric routing?
   a. Reduced bandwidth utilization
   b. Complication in tracing traffic flows
   c. Easier firewall configuration
   d. Prevents load balancing
   Answer: bjumpcloud+2
5. In asymmetrical routing, why can stateful firewalls drop traffic?
   a. Firewall sees only one direction of a connection
   b. Packets are larger than the MTU
   c. Traffic uses IPv6
   d. No DNS resolution
   Answer: anoction+2
6. Which routing protocol can lead to asymmetric routing due to its dynamic nature?
   a. RIP
   b. BGP
   c. OSPF
   d. All of the above
   Answer: djumpcloud+1
7. Which of the following is a benefit of asymmetric routing?
   a. Simplified troubleshooting
   b. Improved load balancing
   c. Reduced path diversity
   d. Easier NAT configuration
   Answer: bnetmaker+1
8. What is symmetric routing?
   a. Routing where traffic takes varying inbound and outbound paths
   b. Routing where packet leaves and returns over the same path
   c. Traffic is dropped at the first hop
   d. Used only in wireless networks
   Answer: bcse.iitb+1
9. When troubleshooting asymmetric routing, what tool helps visualize the path in both directions?
   a. ping only
   b. traceroute
   c. nslookup
   d. arp
   Answer: bauvik+1
10. A consequence of asymmetric routing in a multi-homed ISP environment is:
    a. No impact on NAT devices
    b. Some packets bypassing packet inspection
    c. Reduced DNS performance
    d. Increased ARP requests
    Answer: bcisco+2
11. Which configuration method can reduce asymmetric routing issues for firewalls?
    a. Policy based routing on core switches
    b. NATing all outbound packets at firewall
    c. Disabling ECMP on routers
    d. Using only static routes
    Answer: blearn.microsoft+1
12. Asymmetric routing can cause problems for which of the following?
    a. Transparent switches
    b. Packet sniffers
    c. Stateful intrusion detection systems
    d. Simple routers
    Answer: ccisco+1
13. Why does load balancing with multiple exit/entry points sometimes create asymmetric flows?
    a. Routers always prefer shortest path
    b. Router metrics may differ in each direction
    c. Switches ignore MAC addresses
    d. BGP always advertises same path
    Answer: bnoction+1
14. In which scenario is asymmetric routing usually not a concern?
    a. Presence of stateful firewalls
    b. Use of reverse path filtering
    c. Simple LAN with a single default gateway
    d. Multi-WAN router deployment
    Answer: clearn.microsoft+2
15. Which of these terms is related to asymmetric routing?
    a. Equal-cost multi-path (ECMP)
    b. Spanning Tree Protocol
    c. Rapid Spanning Tree
    d. RIP authentication
    Answer: ageeksforgeeks+2
16. Why might a network engineer intentionally allow asymmetric routing in a network?
    a. For simplicity of configuration
    b. To maximize redundancy and failover
    c. To reduce the number of routes
    d. For better static routing
    Answer: bnetmaker+2
17. What is a common indicator of asymmetric routing when examining packet traces?
    a. Hop counts are always equal
    b. Different routers are seen in opposite directions
    c. Only the source IP appears in logs
    d. Destination MACs remain identical
    Answer: bauvik+1
18. How can asymmetric routing impact packet capture analysis?
    a. It produces easily traceable logs
    b. Captured packets may show missing traffic flows
    c. Disables ICMP responses
    d. Prevents TCP handshake
    Answer: bjumpcloud+2
19. In BGP, why does asymmetric routing frequently occur?
    a. BGP ignores bandwidth in path selection
    b. BGP selects paths independently in each AS
    c. BGP prefers static routes
    d. BGP always honors default gateway
    Answer: bnoction+1
20. Which feature can be implemented on firewalls to specifically support asymmetric routing?
    a. Source address filtering
    b. Asymmetric Routing (ASR) support mode
    c. Port security profiles
    d. IGMP snooping
    Answer: bcisco
21. An enterprise with multiple MPLS circuits between sites is likely to encounter:
    a. Static ARP entries
    b. Asymmetric routing scenarios
    c. Layer 2 loops
    d. IP fragmentation
    Answer: breddit+1
22. To best avoid asymmetric routing, routes should be engineered to be:
    a. More specific in both directions
    b. All default at the core
    c. Avoid source-based NAT
    d. Only summary routes at edge
    Answer: aauvik+1
23. What is the effect of asymmetric routing on NAT if not configured properly?
    a. NAT translations may break, causing packet drops
    b. NAT tables are optimized
    c. NAT is unaffected
    d. NAT performs double translation
    Answer: alearn.microsoft+1
24. Policy-based routing can impact asymmetric routing by:
    a. Always ensuring symmetrical flow
    b. Directing packets based on source/destination address
    c. Disabling BGP
    d. Blocking multicast traffic
    Answer: bjumpcloud+1
25. Which network device is most likely to struggle with asymmetric routing?
    a. Layer 2 switch
    b. Hub
    c. Stateful firewall
    d. Repeater
    Answer: ccisco+1
26. Asymmetric routing is most likely when:
    a. There is a single exit point to the internet
    b. Network uses multiple redundant links with dynamic routing
    c. Only LAN-to-LAN routing occurs
    d. Routing only uses static routes
    Answer: bimedita+1
27. Which solution is commonly recommended to solve asymmetric routing involving firewalls?
    a. Packet sniffing
    b. Deploying firewalls in active/active mode with ASR support
    c. Disabling routing protocols
    d. VLAN segmentation
    Answer: blearn.microsoft+1
28. What is one method for detecting asymmetric routing in a network?
    a. Compare traceroute results in both directions
    b. Syslog-only monitoring
    c. Check for OSPF hello packets
    d. SNMP polling
    Answer: aauvik+1
29. What describes “source-based NAT” as a solution for asymmetric routing?
    a. Provides return traffic a consistent path through NAT
    b. Disables dynamic routing
    c. Eliminates need for default gateways
    d. Randomizes destination IP
    Answer: alearn.microsoft
30. Asymmetric routing can affect which type of network monitoring tool?
    a. Simple SNMP traps
    b. Stateful DPI (deep packet inspection) tools
    c. ICMP-based reachability only
    d. ARP monitoring tools
    Answer: bjumpcloud+1
31. In a cloud data center, asymmetric routing is often caused by:
    a. Flat network topology
    b. Multiple VPC/VRF and redundant uplinks
    c. Lack of routing protocols
    d. Simple switch configuration
    Answer: bnetmaker+1
32. For efficient symmetric routing, which of the following is important?
    a. Use of multiple default gateways
    b. Advertisement of the same subnets on all network paths
    c. Firewalls in active/active mode only
    d. Source NAT on all clients
    Answer: bnoction+1
33. Which statement best defines the effect of asymmetric routing on connection tracking by firewalls?
    a. Enhances connection table accuracy
    b. Can result in firewalls missing return packets, causing connection drops
    c. Decreases the need for state tables
    d. Has no observable effect
    Answer: bcisco+1
34. Which protocol’s ECMP (Equal-Cost Multi-Path) feature can trigger asymmetric routing?
    a. OSPF
    b. EIGRP
    c. BGP
    d. All of the above
    Answer: dgeeksforgeeks+1
35. What should be avoided to prevent asymmetric routing in designing enterprise network topologies?
    a. Multiple equal-cost paths without coordination
    b. Dedicated firewall per VLAN
    c. Single access switch per site
    d. Using static routes for all traffic
    Answer: anoction+1
36. Which statement is TRUE about reverse path forwarding (RPF) and asymmetric routing?
    a. RPF ignores routing symmetry
    b. RPF checks if incoming packet arrived on the best (expected) path to source
    c. RPF prevents ECMP operation
    d. RPF is used only for multicast
    Answer: bauvik+1
37. Which option is a direct outcome if asymmetric routing and stateful firewalls are not coordinated?
    a. Increased redundancy
    b. Legal compliance is ensured
    c. Valid sessions may be blocked
    d. All DNS traffic flows
    Answer: cjumpcloud+1
38. In troubleshooting an asymmetric routing case, which information is MOST critical?
    a. DNS suffix lists
    b. Routing tables on all relevant devices
    c. Port-channel assignments
    d. ARP entries only
    Answer: bauvik+1
39. Which type of firewall mode is better equipped to handle asymmetric routing?
    a. Stateless
    b. Stateful
    c. Transparent
    d. Application-proxy
    Answer: acisco+1
40. What is the primary reason asymmetric routing increases troubleshooting complexity?
    a. Missing return traffic in captures/logs
    b. Routing tables become smaller
    c. MAC address changes on the fly
    d. VLANs perform MAC learning
    Answer: anoction+2
41. In context of Azure ExpressRoute and similar cloud services, how can asymmetric routing occur?
    a. By advertising public IPs over multiple WAN links
    b. Assigning all traffic to a single route only
    c. Disabling NAT on both ends
    d. Using only IPv4 addresses
    Answer: alearn.microsoft
42. Which monitoring solution is often rendered ineffective by asymmetric routing?
    a. Syslog servers
    b. Stateful flow collectors (e.g., NetFlow, sFlow with session correlation)
    c. SNMP-based interface counters
    d. Logging at L2 switches
    Answer: bjumpcloud+1
43. Which cloud security solution is most affected by asymmetric flows?
    a. Agentless security group rules
    b. Stateful intrusion detection appliances
    c. Static security posture configuration
    d. Disabling BGP in VPCs
    Answer: blearn.microsoft+1
44. Which mitigation strategy can help minimize issues with asymmetric routing in a redundant WAN connection?
    a. Implement policy-based routing to control return paths
    b. Use randomized NAT
    c. Disable OSPF advertising
    d. Enable port mirroring
    Answer: anoction+1
45. For asymmetric routing to not cause issues, what must be true for firewall appliances?
    a. All firewalls must share session state
    b. Every packet must be inspected twice
    c. Each link must use a different subnet
    d. Firewalls should operate in isolation
    Answer: acisco+1
46. Which scenario exemplifies asymmetric routing?
    a. Packet leaves via ISP 1 and returns via ISP 2
    b. All packets use the same physical path
    c. Routing is performed by static entries only
    d. A switch drops all multicast frames
    Answer: aimedita+1
47. Which of these routing designs will inherently minimize asymmetric routing risk?
    a. Single default route with all traffic using one exit and entry point
    b. Hybrid WAN topology with unmanaged edges
    c. Full mesh with load balancing across all paths
    d. Multiple NAT devices at different sites
    Answer: ajumpcloud+1
48. In BGP troubleshooting, how can path asymmetry be detected?
    a. Compare AS paths in BGP tables in both directions
    b. Look for duplicate MAC addresses
    c. Only monitor ping roundtrip times
    d. Check for ARP cache entries
    Answer: alinkedin+1
49. The best practice to avoid asymmetric routing problems with stateful devices is:
    a. Ensure packet flows are symmetric or that devices see both directions
    b. Disable BGP
    c. Avoid using VLANs
    d. Enable NAT on all routers
    Answer: alearn.microsoft+2
50. What does asymmetric routing indicate about a network’s design?
    a. It may have multiple potential return or outgoing paths causing differing routes for traffic direction
    b. The same path is always used bi-directionally
    c. VLANs are not segmented
    d. ICMP traffic is blocked by default
    Answer: anoction+2

1. https://www.noction.com/blog/bgp-and-asymmetric-routing
2. https://jumpcloud.com/it-index/what-is-asymmetric-routing
3. https://www.netmaker.io/resources/asymmetric-routing
4. https://learn.microsoft.com/en-us/azure/expressroute/expressroute-asymmetric-routing
5. https://www.cisco.com/web/services/news/ts_newsletter/tech/chalktalk/archives/200903.html
6. https://www.cse.iitb.ac.in/~br/webpage/courses/cs625-fall2003/lec-notes/lec-notes16-2.html
7. https://www.auvik.com/franklyit/blog/asymmetric-routing-issue/
8. https://www.geeksforgeeks.org/computer-networks/routing-switching-interview-questions-computer-networks/
9. https://www.reddit.com/r/networking/comments/7ejww8/riverbed_asymmetrical_routing_question/
10. https://www.imedita.com/blog/top-networking-scenario-based-questions/
11. https://www.linkedin.com/pulse/below-list-150-top-ccnp-interview-questions-network-mukesh-choudhary-0fdge
12. https://www.sanfoundry.com/computer-networks-questions-answers-hierarchical-routing/
13. https://www.sanfoundry.com/computer-networks-questions-answers-ip-routing-2/
14. https://testbook.com/objective-questions/mcq-on-router-and-routing-algorithm–5eea6a0939140f30f369d914
15. https://reck.ac.in/wp-content/uploads/2023/04/DCN_MCQ-Ashwini-.pdf
16. https://www.shiksha.com/online-courses/articles/networking-interview-questions-answers/
17. https://www.geeksforgeeks.org/quizzes/50-computer-networks-mcqs-with-answers/
18. https://www.linkedin.com/pulse/what-asymmetric-routing-causes-problems-networks-hector-cardenas
19. https://www.scribd.com/document/375259068/100-COMPUTER-NETWORKS-Multiple-Choice-Questions-and-Answer
20. https://questions.examside.com/past-years/gate/gate-cse/computer-networks/routing-algorithm