Examtut

Refer to the exhibit. Host A pings interface S0/0 on router 3. What is the TTL value for that ping? A. 252 B. 253 C. 254 D. 255 Answer : B Explanation: The TTL or Time-To-Live gives you an indication of the number of routers between the source and destination. The TTL is used to prevent an IP packet from looping inside an IP network and causing a network meltdown. The initial TTL packet value for an IP packet is 255 and then it is decremented by 1 each time it encounters a router. When this value reaches 0, the packet is discarded by a router. The TTL value is contained in each IP packet including ICMP packets. The TTL value given by the ping command is in fact the TTL value of an echo_response packet. By default, Windows will decrease the TTL by 128 and Ubuntu Linux by 192. The above the exact topology of this questions. I used 10.0.0.1 for Host A’s IP address and 12.0.0.2 for R3 S0/0’s IP address. All router has been config...

Refer to the exhibit. Hosts in network 192.168.2.0 are unable to reach hosts in network 192.168.3.0. Based on the output from RouterA, what are two possible reasons for the failure?(Choose two) A. The cable that is connected to S0/0 on RouterA is faulty. B. Interface S0/0 on RouterB is administratively down. C. Interface S0/0 on RouterA is configured with an incorrect subnet mask. D. The IP address that is configured on S0/0 of RouterB is not in the correct subnet. E. Interface S0/0 on RouterA is not receiving a clock signal from the CSU/DSU. F. The encapsulation that is configured on S0/0 of RouterB does not match the encapsulation that is configured on S0/0 of RouterA. Answer : E, F E: If no clock rate found on DCE end or no keepalive message received , then the Protocol Status changed to down. F: Also if RouterA Serial0/0 and RouterB Serial S0/0 configured with two different protocols (Example: HDLC, PPP), then Protocol statu...

The network administrator has found the following problem. The remote networks 172.16.10.0, 172.16.20.0, and 172.16.30.0 are accessed through the Central router's serial 0/0 interface. No users are able to access 172.16.20.0. After reviewing the command output shown in the graphic, what is the most likely cause of the problem? A. no gateway of last resort on Central B. Central router's not receiving 172.16.20.0 update C. incorrect static route for 172.16.20.0 D. 172.16.20.0 not located in Central's routing table Answer : C Explanation : A static route for 172.16.20.0 is mapped to 172.16.150.15. The route to 172.16.150.0 is mapped to Fa0/0. So if a data from Fast Ethernet 0/0 to 172.16.20.0 network raised, then Central router will loop the data to Fast Ethernet 0/0 itself.

Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission?   A B C D E F Answer : D Explanation: ARP – Address Resolution Protocol It is used to find the MAC address from known IP address. ARP is used to convert an IP address to a physical address such as an Ethernet address (MAC Address). If a host or device transmitting data to another network (not same IP subnet), then data will forward to default gateway. In the exhibit, the Host A is transmitting data to Host B, then Host A forward the packet to Router1, for that communication Host A needs MAC address of Router1. If we check the ARP cache of Host A, we will get 192.168.6.1 – 000f.2480.8916. ...