Free 200-105 sample questions

Correct answer: A static route for the headquarters network (10.10.10.0/24) pointing to the Tunnel0 interface is missing.

The router makes forwarding decisions based on its routing table. Even though the tunnel is configured, the router needs a specific route that directs traffic for the destination network (10.10.10.0/24) into the Tunnel0 interface. Without this route, the router will use the most specific matching route, which in this case is the default route pointing to the ISP. This causes the traffic to be routed to the public internet instead of being encapsulated in the GRE tunnel. Adding a static route like `ip route 10.10.10.0 255.255.255.0 Tunnel0` would resolve the issue.

Correct answer: SW1 will be the active router, and SW2 will be the standby router.

In HSRP, the router with the highest priority value becomes the active router for the group. The default priority is 100. In this configuration, SW1 has a priority of 110, which is higher than SW2's default of 100. Therefore, SW1 will become the active router. The `standby 1 preempt` command on SW1 ensures that if it comes online after SW2 has become active, it will reclaim the active role due to its higher priority.

Correct answer: True

This statement is true. A fundamental concept of multi-area OSPF is that an Area Border Router (ABR) maintains a separate and complete LSDB for each area it borders. This is how OSPF achieves scalability; routers within an area only need to know the detailed topology of their own area, and the ABR summarizes information between areas. Every ABR must be connected to Area 0, so it will always have an LSDB for Area 0 and at least one other non-backbone area.

Correct answer: It consolidates the management plane, allowing all switches to be managed as a single logical device.

The most significant benefit of switch stacking is the simplification of management. A stack of switches operates as a single logical unit with one IP address for management, one configuration file, and a unified control plane. This drastically reduces administrative overhead compared to managing each switch individually. It also simplifies network topology by allowing for the creation of multi-chassis EtherChannels, which eliminates the need for Spanning Tree Protocol to block redundant links between the access and distribution layers.

Correct answer: `copy running-config tftp://192.168.254.100/router-backup.cfg`

Modern Cisco IOS allows for a URL-style syntax to specify the protocol, server, and filename in a single command. The format `tftp:// / ` provides all necessary information to the copy process, avoiding the interactive prompts. This is useful for scripting and automation.

Correct answer: `ipv6 eigrp ` under the interface configuration

Unlike EIGRP for IPv4 (and OSPFv2), which uses the `network` command under the router process to enable the protocol on interfaces, EIGRP for IPv6 (and OSPFv3) is enabled directly on the interface itself. The command `ipv6 eigrp ` is entered in interface configuration mode to make that specific interface participate in the EIGRPv6 process.

Correct answer: `router bgp 65500` `neighbor 203.0.113.1 remote-as 12345` `network 198.51.100.0 mask 255.255.255.0`

The correct configuration requires several key elements: 1) The `router bgp` command must use the local AS number (65500). 2) The `neighbor` command must specify the peer's IP address (203.0.113.1) and their remote AS number (12345). 3) The `network` command is used to inject a route into BGP. It requires the exact network prefix and the corresponding subnet mask using the `mask` keyword. For the route to be advertised, it must exist in the router's routing table.

Correct answer: Use Switched Virtual Interfaces (SVIs) on the multilayer switches for inter-VLAN routing and configure single-area OSPF for routing between all sites.

This solution meets all requirements. SVIs are the modern, scalable method for performing inter-VLAN routing on multilayer switches, providing high performance without the bottleneck of a single router link (Router-on-a-Stick). OSPF is an open-standard, scalable link-state routing protocol suitable for connecting the HQ and branch sites. It is more advanced and scalable than RIPv2 and, being an open standard, is a better choice than the Cisco-proprietary EIGRP in many enterprise environments, especially when future vendor interoperability is a consideration.

Correct answer: It enables BPDU Guard on all operational PortFast ports, shutting them down if a BPDU is received.

The `spanning-tree portfast bpduguard default` command is a global configuration that enables BPDU Guard on any port that has PortFast enabled. PortFast is intended for edge ports connected to end devices, which should never send BPDUs. If a BPDU is received on a PortFast-enabled port with BPDU Guard active, it indicates a potential misconfiguration or unauthorized device (like a switch), and BPDU Guard will place the port into an err-disabled state to prevent a potential STP loop.

Correct answer: The `username` configured on R1 must match the `hostname` of R2, and the passwords must be identical.

In a local CHAP authentication setup, each router authenticates the other. On R1, you must create a user account with the `username` command. This username must exactly match the hostname of the peer router (R2), and the password must match the one configured on R2 for this username. Conversely, R2 must have a user account configured with R1's hostname and the same shared secret. CHAP uses a three-way handshake and does not send the password over the link, making it more secure than PAP.