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Exam Code: 642-889

Exam Name: Implementing Cisco Service Provider Next-Generation Egde Network Services

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642-889 Dumps PDF Total Q&A: 126 Questions and Answers

Last Update: 2016-10-30

642-889 Exam Prep Detail: 642-889 Dumps PDF

 

Exam Code: 100-105

Exam Name: Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

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100-105 Training Materials Total Q&A: 240 Questions and Answers

Last Update: 2016-10-30

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NO.1 Which component of a routing table entry represents the subnet mask?
A. prefix
B. network mask
C. routing protocol code
D. metric
Answer: B

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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.

NO.2 Refer to the exhibit.
Mary is sending an instant message to Robert. The message will be broken into a series of packets
that will traverse all network devices. What addresses will populate these packets as they are
forwarded from Router1 to Router2?
A. Option C
B. Option A
C. Option E
D. Option D
E. Option B
Answer: E

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Explanation:
The Source and Destination IP address is not going to change. Host 1 IP address will stay
as being the source IP and the Host 2 IP address will stay the destination IP address.
Those two are not going to change.
For the MAC address it is going to change each time it goes from one hope to another.
(Except switches... they don't change anything)
Frame leaving HOST 1 is going to have a source MAC of Host 1 and a destination MAC of
Router 1.
Router 1 is going to strip that info off and then will make the source MAC address of Router1's exiting
interface, and making Router2's interface as the destination MAC address. Then the same will
happen... Router2 is going to change the source/destination info to the source MAC being the
Router2 interface that it is going out, and the destination will be Host2's MAC address.