Practise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command.
Start Scenario PracticeA network engineer is troubleshooting connectivity issues and wants to verify the path that packets take from a source to a destination IP address. Which OSI layer is primarily responsible for packet forwarding and routing?
Explanation: The Network layer (Layer 3) is responsible for packet forwarding and routing, using logical IP addresses to determine the best path from source to destination. Protocols like IP (IPv4/IPv6) and routing protocols (e.g., OSPF, BGP) operate at this layer to make forwarding decisions. The traceroute command is a common tool that leverages Layer 3 TTL (Time-to-Live) fields to map the path packets take.
A network engineer configures an HTTP/2 server. Which feature of HTTP/2 reduces overhead by compressing headers using HPACK?
Explanation: HPACK is the header compression mechanism specified for HTTP/2 (RFC 7541). It reduces overhead by encoding HTTP headers into a compact binary format using static and dynamic tables, eliminating redundant header data across requests. This directly addresses the question's focus on reducing overhead through header compression.
A developer needs to send a diagnostic request to a network device to verify if it supports a specific MIB object. Which protocol and operation should be used?
Explanation: SNMP GET is the correct operation to retrieve the value of a specific MIB object from a network device. It sends a diagnostic request to verify if the device supports that object by checking whether a valid response is returned. This is the standard SNMP operation for reading a single managed object's value.
A network engineer is configuring a new switch and needs to ensure that frames from VLAN 10 and VLAN 20 are isolated on the same trunk link to another switch. Which IEEE standard should be configured on the trunk interfaces?
Explanation: C is correct because 802.1Q is the IEEE standard that defines VLAN tagging, allowing multiple VLANs (such as VLAN 10 and VLAN 20) to be carried over a single trunk link while maintaining isolation between them. By inserting a 4-byte VLAN tag into the Ethernet frame, 802.1Q enables the receiving switch to identify which VLAN a frame belongs to, ensuring traffic from different VLANs remains separate.
An engineer is troubleshooting packet loss between two hosts on different subnets. The traceroute shows that packets reach the first hop router but then stop. The router's ARP table shows an incomplete entry for the next-hop IP address. What is the most likely cause?
Explanation: An incomplete ARP entry for the next-hop IP address indicates that the router sent an ARP request but received no reply. This typically means the next-hop device is unreachable at Layer 2, often because it is powered off, has a failed interface, or there is a cabling issue. Since traceroute shows packets reaching the first hop but not beyond, the Layer 2 failure at the next hop is the most direct cause.
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Practice all Which Command Should the Administrator Use Practice QuestionsPractise command-choice questions where the task is to identify the correct verification, configuration or troubleshooting command. These appear throughout the 200-901 and require you to apply your knowledge, not just recall facts.
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the 200-901. Practicing each scenario type ensures you're ready for any format.
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