Computer Networks

VTP (VLAN Trunking Protocol) requires switches to be in the same domain to exchange VLAN information. Without matching domain names, VTP advertisements are ignored between switches, preventing VLAN synchronization. The revision number automatically synchronizes once domains match - it should NOT be manually set higher.

The correct command sequence for configuring OSPF in a single area configuration is:

router ospf <process-id> network <network address> <wildcard mask> area <area number>

Answer A would include all interfaces on the router, the commands in answer D define them individually per interface.

In RIP, when a directly connected network goes down, the router immediately sends triggered updates to its directly connected neighbors containing the withdrawn route. This is a rapid convergence mechanism - unlike regular periodic updates, triggered updates happen immediately to propagate topology changes faster through the network.

CIDR notation /8 indicates a subnet mask of 255.0.0.0, meaning the first 8 bits (first octet) of the destination IP must match 10.x.x.x for this route to be used. This is the prefix length - it tells the router how many bits, starting from the left, must match the network address. The remaining bits can vary for individual host addresses within that network.

ACL 110 permits TCP traffic from 172.22.10.0/24 and denies all other TCP traffic. When applied inbound on S0/0/0, it allows return traffic for sessions that originated from the internal network 172.22.10.0/24. This is because stateful firewalls or ACLs with established keyword permit return traffic for outbound-initiated connections - the ACL allows traffic FROM that network to return inbound.

The only valid way to measure performance impact is to compare current performance against a previously established baseline. A baseline provides the reference point for what normal performance looked like before the change. Options B, C, and D either measure from external sources (uncontrolled variables), rely on subjective perception, or measure traffic volume rather than performance - none of which isolate the effect of the configuration change.

Port numbers 0-1023 are the well-known ports, reserved by IANA for standard services like HTTP (80), HTTPS (443), SSH (22), FTP (21), etc. These require privileged access to bind to. Ports 1024-49151 are registered ports, and 49152-65535 are dynamic/private ports used for ephemeral connections by clients.

Every ACL has an implicit deny any at the end. The packet with source 10.1.1.1 and destination 192.168.10.13 doesn't match line 10 (which permits 192.168.0.0/16) OR line 20 (which permits host 192.168.10.1). Since it matches none of the explicit permit statements, it hits the implicit deny any and is dropped. The IP doesn't match line 20 (192.168.10.1), and line 10 permits the 192.168.0.0/16 network but the question implies it doesn't match.

ARP is used to find a MAC address. Because the routers build new MAC headers and trailers, and because the new headers contain MAC addresses, the routers must have some way to decide what MAC addresses to use. An example of how the router determines which MAC address to use is the IP Address Resolution Protocol (ARP) protocol. ARP is used to dynamically learn the MAC address of some IP host.

To enable RIP on Router B for all connected networks, you must: enter global config mode (config#), start RIP configuration (router rip), then specify each network with the 'network' command. Option B is correct because it specifies the network command at the appropriate config-router prompt level. Option A is incomplete, Option C is at wrong prompt, Options D/E are incomplete.

Router-on-a-stick uses subinterfaces with 802.1Q encapsulation to route between VLANs. Each subinterface is configured with an encapsulation dot1q command. When traffic arrives on the physical interface with a VLAN tag, the router directs it to the matching subinterface based on that VLAN ID. Subinterface fa0/0.2 handles VLAN 2 traffic. The physical interface fa0/0 itself doesn't process the VLAN-tagged traffic - the subinterfaces do based on VLAN tags.

HDLC is a basic WAN encapsulation protocol that provides no authentication mechanism. PPP was designed with extensible features including authentication protocols (PAP and CHAP) that can verify the identity of connecting devices before establishing a full connection.