CloudNetX Root Cause Analysis Quiz

1. A CloudNetX network segment experiences intermittent connectivity loss. How should you determine if the issue is at Layer 2 or Layer 3?

Check ARP table and ping gateway; Layer 3 if ping fails but ARP succeeds

Run nslookup to test DNS resolution

Examine BGP neighbor status

Verify VLAN membership only

Submit

3. A CloudNetX network restoration plan requires verifying that all critical services are reachable. What is the most efficient method?

Perform connectivity tests to key gateways and services using ping and traceroute

Reboot all network devices

Clear all ARP and MAC tables

Reconfigure all IP addresses

4. In CloudNetX, an outbound connection is established but data transfer stalls. Which parameter is most likely causing the issue?

MTU size mismatch or black hole on the path

Incorrect subnet mask

Wrong MAC address

Incorrect VLAN ID

5. A CloudNetX device cannot obtain a DHCP lease. Which diagnostic command reveals if the device is sending DHCP requests?

Tcpdump or packet capture on the DHCP port

Ipconfig /release and /renew only

Ping 8.8.8.8

Nslookup google.com

6. When troubleshooting CloudNetX, you observe that the same subnet appears in the routing table via two different protocols. Which protocol typically takes precedence?

The one with the lower administrative distance

OSPF always

BGP always

The one learned first

7. In CloudNetX, VLAN traffic between switches fails while intra-VLAN communication works. What is the most likely cause?

Trunk link is misconfigured or down

DHCP server is offline

Default gateway is unreachable

DNS is not resolving hostnames

8. A CloudNetX customer reports that file transfer speeds are significantly slower than usual. Which metric should you check first?

Link utilization, packet loss, and latency

Server CPU usage alone

Number of VLAN interfaces

System uptime

9. In CloudNetX, a static route becomes unreachable after a device restart. What is the likely cause?

Static route was not saved in startup configuration

OSPF automatically removed it

The gateway interface is up but ARP is disabled

DHCP assigned a different IP address

10. When a CloudNetX interface reports 'input errors' in statistics, which hardware component is most commonly at fault?

Network interface card or transceiver

Hard drive

RAM module

System fan

11. When a CloudNetX network segment loses connectivity, which diagnostic tool should you use first to verify end-to-end path availability?

Traceroute or tracert

Ping

Netstat

Arp -a

12. In CloudNetX, you identify that ICMP packets are being dropped at a firewall. Which protocol or service is most likely to be affected?

Ping, traceroute, and path MTU discovery

HTTP and HTTPS only

DNS queries and responses

DHCP client-server communication

13. A CloudNetX spanning tree topology change occurs unexpectedly. Which device state change indicates a link failure or reconfiguration?

Designated port becomes blocking

Root port transitions to forwarding

Port moves from forwarding to blocking

Bridge priority increases

14. When analyzing CloudNetX logs, you see repeated 'duplex mismatch' warnings. What is the immediate impact on network performance?

Packet loss, frame errors, and reduced throughput

Increased latency only

DNS resolution failures

DHCP lease expiration

15. A CloudNetX customer cannot reach external services, but internal network communication works. What troubleshooting step should you perform next?

Check default gateway and routing to ISP

Reboot all switches

Clear the ARP cache

Reset all VLAN configurations

16. In CloudNetX, after replacing a failed fiber optic link, the new interface remains down. What is the most common cause?

Interface is administratively shut down

Incompatible SFP module type

Routing table was not updated

DHCP server is offline

17. A CloudNetX interface shows high CPU utilization and packet drops. Which command helps identify if the interface queue is overflowing?

Show interface stats

Show processes cpu

Show ip route

Show running-config

18. When troubleshooting a CloudNetX outage, you discover that ARP replies are not reaching the source device. What is the most probable issue?

Broadcast domain is isolated or blocked

TCP window size is too small

DNS server is unreachable

MTU size mismatch on the interface

19. In CloudNetX, a BGP session between two routers flaps repeatedly. Which parameter should you examine to prevent route instability?

BGP timers and hold time

OSPF cost metrics

VLAN tagging configuration

MAC address table entries

20. A CloudNetX customer reports intermittent packet loss on their WAN link. What is the most likely cause if loss occurs only during peak business hours?

Interface hardware failure

Link congestion or buffer overflow

Routing protocol misconfiguration

DNS resolution timeout

CloudNetX Root Cause Analysis for Network Outages Quiz