Exact CCNA Routing and Switching 200-105 braindumps

Answer: B

Explanation:

In order to be sufficiently versatile to be portable to a wide variety of environments, PPP provides a Link

Control Protocol (LCP). The LCP is used to automatically agree upon the encapsulation format options, handle varying limits on sizes of packets, detect a looped-back link and other common misconfiguration errors, and terminate the link. Other optional facilities provided are authentication of the identity of its peer on the link, and determination when a link is functioning properly and when it is failing.

Reference: Link Control Protocol

http://www.ietf.org/rfc/rfc1661.txt

Answer: C

Explanation:

First we should grasp the concept of BECN & FECN through an example:

Suppose Router A wants to send data to Router B through a Frame Relay network. If the network is congested, Switch 1 (a DCE device) will set the FECN bit value of that frame to 1, indicating that frame experienced congestion in the path from source to destination. This frame is forwarded to Switch 2 and to Router B (with the FECN bit = 1).

Switch 1 knows that the network is congesting so it also sends frames back to Router A

with BECN bit set to 1 to inform that path through the network is congested.

In general, BECN is used on frames traveling away from the congested area to warn source devices that congestion has occurred on that path while FECN is used to alert receiving devices if the frame experiences congestion.

BECN also informs the transmitting devices to slow down the traffic a bit until the network returns to normal state.

The question asks u201cwhich output value indicates to the local router that traffic sent to the corporate site is experiencing congestionu201d which means it asks about the returned parameter which indicates congestion ->BECN.

Answer: D

Answer: C

Explanation:

DLCI 16 and DLCI 19 need to act like a point-to-point link and will therefore need to be on the same network as will DLCI 17 and DLCI 28. With this information we can see that option "B" is the only option that has the corresponding DLCI's on the same network based on the ip addresses and subnetmask.

Option "D" is incorrect because, this would put the same network on both interfaces of the R2 router. Option "A" is similar.

Answer: D

Explanation:

Ping is a tool that helps to verify IP-level connectivity; PathPing is a tool that detects packet loss over multiple-hop trips. When troubleshooting, the ping command is used to send an ICMP Echo Request to a target host name or IP address. Use Ping whenever you want to verify that a host computer can send IP packets to a destination host. You can also use the Ping tool to isolate network hardware problems and incompatible configurations.

If you call ipconfig /all and receive a response, there is no need to ping the loopback address and your own IP address u2014 Ipconfig has already done so in order to generate the report.

It is best to verify that a route exists between the local computer and a network host by first using ping and the IP address of the network host to which you want to connect. The command syntax is:

ping < IP address >

Perform the following steps when using Ping:

u2711 Ping the loopback address to verify that TCP/IP is installed and configured correctly on the local computer.

ping 127.0.0.1

If the loopback step fails, the IP stack is not responding. This might be because the TCP drivers are corrupted, the network adapter might not be working, or another service is interfering with IP.

u2711 Ping the IP address of the local computer to verify that it was added to the network

correctly. Note that if the routing table is correct, this simply forwards the packet to the loopback address of 127.0.0.1.

ping < IP address of local host >

u2711 Ping the IP address of the default gateway to verify that the default gateway is functioning and that you can communicate with a local host on the local network.

ping < IP address of default gateway >

u2711 Ping the IP address of a remote host to verify that you can communicate through a router.

ping < IP address of remote host >

u2711 Ping the host name of a remote host to verify that you can resolve a remote host name.

ping < Host name of remote host >

u2711 Run a PathPing analysis to a remote host to verify that the routers on the way to

the destination are operating correctly. pathping < IP address of remote host >

Answer: C

Explanation:

First, the question asks what switch services the printers, so it can be Switch 3 or Switch 4 which is connected directly to the Printers.

Designated port is a port that is in the forwarding state. All ports of the root bridge are designated ports.

Switch 3 and Switch 4 has same priority so it will see on lowest MAC address and here switch 3 has lowest MAC address. So switch 3 segment will play a Designated port role. By comparing the MAC address of Switch 3 and Switch 4 we found that the MAC of Switch 3 is smaller. Therefore the interface connected to the Printers of Switch 3 will become designated interface and the interface of Switch 4 will be blocked.

Answer: B,E

Explanation:

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cf a.shtml

Port Roles

The role is now a variable assigned to a given port. The root port and designated port roles remain, while the blocking port role is split into the backup and alternate port roles. The Spanning Tree Algorithm (STA) determines the role of a port based on Bridge Protocol Data Units (BPDUs). In order to simplify matters, the thing to remember about a BPDU is there is always a method to compare any two of them and decide whether one is more useful than the other. This is based on the value stored in the BPDU and occasionally on the port on which they are received. This considered, the information in this section explains practical approaches to port roles.

Compatibility with 802.1D

RSTP is able to interoperate with legacy STP protocols. However, it is important to note that the inherent fast convergence benefits of 802.1w are lost when it interacts with legacy bridges.

Answer: D,F

Explanation: http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a 00800949fd.shtml

Answer: B

Explanation:

Interface fa0/0 breaks into sub-interfaces and Main_Campus router is connected with

switch via fa0/0 .Subinterfaces configured with different subnet masks so the same switch has multiple vlans and allows communication between these VLAN's. For routing and inter- vlan we need to configure a trunk port. So B will be the correct answer.

Answer: A,C,D