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IP Routing

November 7th, 2017 Go to comments

Question 1

Explanation

When one route is advertised by more than one routing protocol, the router will choose to use the routing protocol which has lowest Administrative Distance. The Administrative Distances of popular routing protocols are listed below:

EIGRP_Administrative Distances_popular_routing_protocols.jpg

Question 2

Explanation

The simple syntax of static route:

ip route destination-network-address subnet-mask {next-hop-IP-address | exit-interface}
+ destination-network-address: destination network address of the remote network
+ subnet mask: subnet mask of the destination network
+ next-hop-IP-address: the IP address of the receiving interface on the next-hop router
+ exit-interface: the local interface of this router where the packets will go out

In the statement “ip route 192.168.0.0 255.255.240.0 GigabitEthernet0/1″:

+ 192.168.0.0 255.255.240.0: the destination network
+ GigabitEthernet0/1: the exit-interface

Question 3

Question 4

Explanation

The static routing specifies a fixed destination so it is “consistent”. It is best used for small-scaled places where there are a few routers only. When links fail, static route cannot automatically find an alternative path like dynamic routing so routing is disrupted.

Question 5

Explanation

Host Z will use ARP to get the MAC address of the interface on R1 that connects to it and use this MAC as the destination MAC address. It use the IP address of the storage server as the destination IP address.

For example in the topology below, host A will use the MAC address of E0 interface of the router as its destination MAC address to reach the Email Server.

destination_addresses.jpg

Question 6

Explanation

The Administrative Distance (AD) of popular routing protocols is shown below. You should learn them by heart:

EIGRP_Administrative Distances_popular_routing_protocols.jpg

Note: The AD of iBGP is 200

The smaller the AD is, the better it is. The router will choose the routing protocol with smallest AD.

In this case EIGRP with AD of 90 is the smallest one.

Question 7

Question 8

Question 9

Explanation

The Layer 2 information (source and destination MAC) would be changed when passing through each router. The Layer 3 information (source and destination IP addresses) remains unchanged.

Question 10

Question 11

Comments (2) Comments
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  1. Anonymous
    November 8th, 2018

    Hey whats up anyone can help me or point me in the right direction to the 200-125.. Im poor trying to get certified to support my family. thanks fedsoo@yahoo

  2. MJ
    November 11th, 2018

    Q8 Explanation:
    Explanation:
    IP Routing Table Entry TypesAn entry in the IP routing table contains the following information in the order presented:
    Network ID. The network ID or destination corresponding to the route. The network ID can be class-based, subnet, or supernet network ID, or an IP address for a host route. Network Mask.
    The mask that is used to match a destination IP address to the network ID.
    Next Hop. The IP address of the next hop.
    Interface. An indication of which network interface is used to forward the IP packet. Metric. A number used to indicate the cost of the route so the best route among possible multiple routes to the same destination can be selected. A common use of the metric is to indicate the number of hops (routers crossed) to the network ID. Routing table entries can be used to store the following types of routes:
    Directly Attached Network IDs. Routes for network IDs that are directly attached. For directly attached networks, the Next Hop field can be blank or contain the IP address of the interface on that network.
    Remote Network IDs. Routes for network IDs that are not directly attached but are available across other routers. For remote networks, the Next Hop field is the IP address of a local router in between the forwarding node and the remote network. Host Routes. A route to a specific IP address. Host routes allow routing to occur on a per- IP address basis. For host routes, the network ID is the IP address of the specified host and the network mask is 255.255.255.255. Default Route. The default route is designed to be used when a more specific network ID or host route is not found. The default route network ID is 0.0.0.0 with the network mask of 0.0.0.0.

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