Enhance Your Knowledge On Ccna2 Final E

EIGRP (Enhanced Interior Gateway Routing Protocol) maintains a topology table separate from the routing table. This allows EIGRP to have a more detailed view of the network topology, including information about all available routes, their metrics, and their status. By keeping this information in a separate table, EIGRP can make more efficient and informed routing decisions, resulting in better network performance and faster convergence.

The correct password that the administrator should enter at the R1> prompt to access the privileged EXEC mode is "Cisco789".

The router enters setup mode because the configuration file is missing from NVRAM. Setup mode allows the user to configure basic settings for the router, such as hostname, IP addresses, and passwords. When the router boots and cannot find the configuration file in NVRAM, it prompts the user to enter setup mode to create a new configuration. This is a common scenario when a router is newly installed or if the configuration file has been accidentally deleted or lost.

The highlighted value of 2 represents the number of hops between R2 and the 192.168.8.0/24 network. This means that it takes two intermediary devices (routers) for traffic to reach the 192.168.8.0/24 network from R2.

The cause of the problem could be that RIPv1 does not support discontiguous networks. This means that RIPv1 cannot handle networks that are not directly connected or have non-contiguous subnet masks. As a result, the two networks 10.1.1.0/29 and 10.1.1.16/29 are unable to communicate with each other because RIPv1 cannot properly route the traffic between them.

The subnet 192.168.1.64/26 should be used for the new subnet. This subnet provides enough addresses for 62 hosts (64 - 2 for network and broadcast addresses) while wasting a minimum of addresses. The other subnets have smaller address ranges and would not provide enough addresses for 50 hosts.

Hold-down timers and split horizon are two technologies that can be used in distance vector routing protocols to prevent routing loops. Hold-down timers are used to temporarily ignore route updates after a route has been invalidated, preventing the router from immediately accepting a potentially incorrect route. Split horizon is a technique where a router does not advertise a route back to the same interface from which it was learned, preventing routing loops by not allowing a route to be sent back in the direction it came from.

RIP (Routing Information Protocol) uses the Bellman-Ford algorithm to determine the best path. This algorithm calculates the shortest path to a destination by considering the number of hops (routers) between the source and destination. Additionally, RIP periodically sends complete routing tables to all connected devices, ensuring that each device has the most up-to-date information about the network's topology. This helps in maintaining accurate routing information and allows for efficient routing within the autonomous system.

The router will need to perform a recursive lookup for packets destined to the networks 10.0.0.0/8 and 192.168.2.0/24. This means that the router will have to consult its routing table and potentially query other routers to determine the next hop for these packets. The other networks listed in the exhibit have more specific subnet masks (e.g., /16 or /24) which means that the router can determine the next hop for those packets without needing to perform a recursive lookup.

The reason why Host A is unable to access the Internet is because the Fa0/1 interfaces of the two routers are configured for different subnets. This means that the routers are not able to properly route the traffic from Host A to the Internet, as they are not on the same subnet.

The reason for the problem is that one of the default routes is configured incorrectly. A default route is used when a router does not have a specific route for a destination network. In this case, the incorrect configuration of one of the default routes is causing the failure of pings from host A to operational hosts on the Internet.

Split horizon is a mechanism that prevents a router from advertising a route back onto the same interface from which it was learned. In this scenario, R2 is prevented from receiving false update information regarding the 10.4.0.0 network because split horizon would prevent R1 from advertising that route back to R2 on the same interface. This helps to avoid routing loops and ensures that R2 does not receive incorrect or outdated routing information.

The routers in the network will use the highest IP address among the active interfaces to determine the router ID. The router ID is a unique identifier for each router in OSPF, and it is used for various purposes such as the selection of the designated router and the calculation of the shortest path tree. In this case, since no loopback interface has been set on any of the routers, the highest IP address among the active interfaces will be used as the router ID.

The OSPF LSR (Link State Request) packet is used by receiving routers to request more information about any entry in the DBD (Database Description). This packet is sent when a router needs more detailed information about a particular entry in the database. By requesting additional information, the router can ensure that it has the most up-to-date and accurate data for making routing decisions.

Two static routes that can be configured on R1 to enable Internet connectivity for host A are "ip route 0.0.0.0 0.0.0.0 Fa0/1" and "ip route 0.0.0.0 0.0.0.0 10.1.1.2". The first route specifies that any traffic with a destination IP address of 0.0.0.0 should be forwarded out of the Fa0/1 interface. The second route specifies that any traffic with a destination IP address of 0.0.0.0 should be forwarded to the next hop IP address 10.1.1.2. These routes will allow host A to reach the Internet.

The correct answer is B(config)# router rip B(config-router)# passive-interface S0/0 A(config)# no router rip. This command sequence first enables RIP routing protocol on router B using "router rip" command. Then, it configures the interface S0/0 as passive using "passive-interface S0/0" command, which prevents RIP updates from being sent or received on that interface. Finally, it disables RIP routing protocol on router A using "no router rip" command. This combination of commands ensures that RIP updates are not sent to router A.

The exhibit shows the output of the "show ip route" command on Router A. The routing table does not have a specific entry for the link to the ISP (192.168.1.0/24). This means that the routing protocol process is not advertising this network to other routers. Therefore, the statement "The link to the ISP is not advertised by the routing protocol process" is true.

From the output of the "debug iprip" command, it can be determined that the router has two interfaces that participate in the RIP (Routing Information Protocol) process. This means that the router is actively exchanging routing information with other routers in the network using RIP. This information is useful for diagnosing routing problems and understanding the network topology.

If the network uses the RIP protocol, router A will determine that all paths have equal cost. This is because RIP uses hop count as the metric to determine the best path, and in this scenario, all paths have the same number of hops. Therefore, router A will see all paths as having equal cost and will choose any of them to forward data to router E.

The split horizon with poison reverse method of routing loop prevention assigns a value that represents an infinite metric to the poisoned route. This ensures that the poisoned route is considered unreachable and not used for forwarding packets. Additionally, this method limits the number of hops a packet can traverse through the network before it is discarded. By discarding packets that exceed the hop limit, the method prevents routing loops and improves network efficiency.

Routing loops can occur for two reasons: incorrectly configured static routes and static and dynamic routing being used on the same router. Incorrectly configured static routes can lead to loops when the routes are pointing to each other or when there are overlapping routes. When static and dynamic routing protocols are used on the same router, there is a possibility of conflicting information being received, leading to loops. Slow convergence, routes learned via two routing protocols, and lack of a default route on the router that connects to the Internet are not directly related to the occurrence of routing loops.

The given correct answer states that the AD (Administrative Distance) of EIGRP routes has been manually changed to a value other than the default value. This means that the router is prioritizing EIGRP routes over other routing protocols. The answer also mentions that Router1 is running both the EIGRP and OSPF routing processes, indicating that the router is using multiple routing protocols. Additionally, it states that Network 172.17.0.0 can only be reached using a default route, implying that there is no specific route for this network in the routing table.