Refer to the exhibit.
The network administrator is testing connectivity from the branch router to the newly installed
application server. What is the most likely reason for the first ping having a success rate of only 60
percent?
A.
The network is likely to be congested, with the result that packets are being intermittently
dropped.
B.
The branch router had to resolve the application server MAC address.
C.
There is a short delay while NAT translates the server IP address.
D.
A routing table lookup delayed forwarding on the first two ping packets.
E.
The branch router LAN interface should be upgraded to FastEthernet.
A router[a] is a networking device that forwards data packets between computer networks. Routers perform the “traffic directing” functions on the Internet. A data packet is typically forwarded from one router to another through the networks that constitute the internetwork until it reaches its destination node.[1]
A router is connected to two or more data lines from different networks (as opposed to a network switch, which connects data lines from one single network).
When a data packet comes in on one of the lines, the router reads the address information in the packet to determine its ultimate destination. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey. This creates an overlay internetwork.
The most familiar type of routers are home and small office routers that simply pass data, such as web pages, email, IM, and videos between the home computers and the Internet.
An example of a router would be the owner’s cable or DSL router, which connects to the Internet through an ISP. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.
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The ping command is a very common method for troubleshooting the accessibility of devices. It uses a series of Internet Control Message Protocol (ICMP) Echo messages to determine:
Whether a remote host is active or inactive.
The round-trip delay in communicating with the host.
Packet loss.
The ping command first sends an echo request packet to an address, then waits for a reply. The ping is successful only if:
the echo request gets to the destination, and
the destination is able to get an echo reply back to the source within a predetermined time called a timeout. The default value of this timeout is two seconds on Cisco routers.
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