CCNA 200-301 Reddit Questions

The ACL already contains logic intended to permit SSH for the operations subnet, but a broader deny statement blocks the traffic before the useful permit can take effect. ACLs are processed top-down, first match wins. Once traffic matches a deny entry, later permit statements are never evaluated. The operations network is 10.20.1.0/25, which is covered inside the broader 10.20.1.0 wildcard range shown in the deny statement. Removing that deny entry allows the existing SSH permit for the operations subnet to work as intended. Adding a UDP permit would not help SSH because SSH uses TCP port 22. Adding a permit in the wrong direction or with the wrong wildcard would not fix the top-down logic problem. Cisco CCNA 200-301 v1.1 Security Fundamentals expects candidates to troubleshoot ACL order, wildcard masks, protocol matching, and implicit deny behavior. The command that accomplishes the task is to remove the blocking deny statement, so D is correct.

Virtualization allows multiple independent operating systems and applications to run on the same physical server, each inside its own virtual machine. It also introduces logical switching so traffic can move between virtual machines on the same host and out to the physical network through a physical NIC. This is why network engineers must understand virtual switches, port groups, VLAN tagging, and hypervisor uplinks. Cisco CCNA 200-301 v1.1 includes virtualization in Network Fundamentals because modern campus and data-center traffic often begins or ends inside a virtualized host. The environment does not require a dedicated hypervisor used only as an SNMP network manager, and a physical router does not directly connect to each VM NIC. Virtualization also does not require systems to reside on the internet. The core points are resource abstraction and logical connectivity. Multiple OS instances share one physical hardware platform, and virtual network devices move traffic between VMs and the physical network. That makes B and C correct.

Dynamic desirable actively attempts to form a trunk by sending Dynamic Trunking Protocol messages. If the neighboring switch is in trunk, dynamic desirable, or dynamic auto mode, the link negotiates as a trunk. The result described by option D is therefore correct: the link becomes a trunk port. The link would not be down or err-disabled simply because dynamic desirable is configured. It also would not become an access port if the DTP negotiation succeeds. This question tests a common CCNA 200-301 v1.1 Network Access table: trunk and dynamic desirable form a trunk; desirable and auto form a trunk; auto and auto do not actively negotiate a trunk. In production, many engineers avoid DTP by hard-coding trunk mode and using switchport nonegotiate, but the exam still expects recognition of DTP behavior. The verified answer is D. Reference: Cisco Catalyst trunking and Dynamic Trunking Protocol configuration behavior.

Routers choose the route with the longest matching prefix before comparing protocol preference for equally specific routes. If the RIP entry contains the longest prefix that includes destination 192.168.12.16, that route is selected even though RIP has a worse administrative distance than OSPF or EIGRP. Administrative distance only becomes the deciding factor when competing routes describe the same prefix length. Cisco CCNA 200-301 v1.1 IP Connectivity repeatedly tests this rule because it is fundamental to forwarding decisions. The router does not load-balance among routes simply because multiple protocols know related networks. It also does not choose EIGRP solely because EIGRP has a lower administrative distance when another route is more specific. The forwarding lookup starts with the destination IP address and finds the most specific matching prefix in the routing table. In this exhibit, the RIP route is the longest prefix inclusive of 192.168.12.16, so A describes the router behavior correctly.