READ Free Dumps For Cisco- 200-125
| Question ID 15967 | Refer to the graphic.
Host A is communicating with the server. What will be the source MAC address of the
frames received by Host A from the server?
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| Option A | the MAC address of router interface e0
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| Option B | the MAC address of router interface e1
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| Option C | the MAC address of the server network interface
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| Option D | the MAC address of host A
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| Correct Answer | A |
Explanation Explanation: Whereas switches can only examine and forward packets based on the contents of the MAC header, routers can look further into the packet to discover the network for which a packet is destined. Routers make forwarding decisions based on the packet's network- layer header (such as an IPX header or IP header). These network-layer headers contain source and destination network addresses. Local devices address packets to the router's MAC address in the MAC header. After receiving the packets, the router must perform the following steps: 1. Check the incoming packet for corruption, and remove the MAC header. The router checks the packet for MAC-layer errors. The router then strips off the MAC header and examines the network-layer header to determine what to do with the packet. 2. Examine the age of the packet. The router must ensure that the packet has not come too far to be forwarded. For example, IPX headers contain a hop count. By default, 15 hops is the maximum number of hops (or routers) that a packet can cross. If a packet has a hop count of 15, the router discards the packet. IP headers contain a Time to Live (TTL) value. Unlike the IPX hop count, which increments as the packet is forwarded through each router, the IP TTL value decrements as the IP packet is forwarded through each router. If an IP packet has a TTL value of 1, the router discards the packet. A router cannot decrement the TTL value to 1 and then forward the packet. 3. Determine the route to the destination. Routers maintain a routing table that lists available networks, the direction to the desired network (the outgoing interface number), and the distance to those networks. After determining which direction to forward the packet, the router must build a new header. (If you want to read the IP routing tables on a Windows 95/98 workstation, type ROUTE PRINT in the DOS box.) 4. Build the new MAC header and forward the packet. Finally, the router builds a new MAC header for the packet. The MA
| Question ID 15968 | A router has two Fast Ethernet interfaces and needs to connect to four VLANs in the local
network. How can you accomplish this task, using the fewest physical interfaces and
without decreasing network performance?
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| Option A | Use a hub to connect the four VLANS with a Fast Ethernet interface on the router.
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| Option B | Add a second router to handle the VLAN traffic.
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| Option C | Add two more Fast Ethernet interfaces.
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| Option D | Implement a router-on-a-stick configuration.
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| Correct Answer | D |
Explanation Explanation: A router on a stick allows you to use sub-interfaces to create multiple logical networks on a single physical interface.