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New Cisco 200-125 Exam Dumps Collection (Question 4 - Question 13)
Question No: 4
Which function of the IP SLAs ICMP jitter operation can you use to determine whether a VoIP issue is caused by excessive end-to-end time?
A. packet loss
B. jitter
C. successive packet loss
D. round-trip time latency
Answer: D
Question No: 5
Which spanning-tree feature places a port immediately into a forwarding stated?
A. BPDU guard
B. PortFast
C. loop guard
D. UDLD
E. Uplink Fast
Answer: B
Explanation:
PortFast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.You can use PortFast on switch or trunk ports that are connected to a single workstation, switch, or server to allow those devices to connect to the network immediately, instead of waiting for the port to transition from the listening and learning states to the forwarding state.
Question No: 6
Which two statements about the tunnel mode ipv6ip command are true? (Choose two.)
A. It enables the transmission of IPv6 packets within the configured tunnel.
B. It specifies IPv4 as the encapsulation protocol.
C. It specifies IPv6 as the encapsulation protocol.
D. It specifies IPv6 as the transport protocol.
E. It specifies that the tunnel is a Teredo tunnel.
Answer: A,B
Question No: 7
What is the first step in the NAT configuration process?
A. Define inside and outside interfaces.
B. Define public and private IP addresses.
C. Define IP address pools.
D. Define global and local interfaces.
Answer: A
Question No: 8
Which command can you use to set the hostname on a switch?
A. switch-mdf-c1(config)#hostname switch-mdf1
B. switch-mdf-c1>hostname switch-mdf1
C. switch-mdf-c1#hostname switch-mdf1
D. switch-mdf-c1(config-if)#hostname switch-mdf1
Answer: A
Question No: 9
What is the best way to verify that a host has a path to other hosts in different networks?
A. Ping the loopback address.
B. Ping the default gateway.
C. Ping the local interface address.
D. Ping the remote network.
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, thepingcommand 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 callipconfig /alland 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>
Question No: 10
Which identification number is valid for an extended ACL?
A. 1
B. 64
C. 99
D. 100
E. 299
F. 1099
Answer: D
Question No: 11
Under which circumstance should a network administrator implement one-way NAT?
A. when the network must route UDP traffic
B. when traffic that originates outside the network must be routed to internal hosts
C. when traffic that originates inside the network must be routed to internal hosts
D. when the network has few public IP addresses and many private IP addresses require outside access
Answer: B
Explanation: NAT operation is typically transparent to both the internal and external hosts. Typically the internal host is aware of the true IP address and TCP or UDP port of the external host. Typically the NAT device may function as the default gateway for the internal host. However the external host is only aware of the public IP address for the NAT device and the particular port being used to communicate on behalf of a specific internal host.
NAT and TCP/UDP
"Pure NAT", operating on IP alone, may or may not correctly parse protocols that are totally concerned with IP information, such asICMP, depending on whether the payload is interpreted by a host on the "inside" or "outside" of translation. As soon as the protocol stack is traversed, even with such basic protocols asTCPandUDP, the protocols will break unless NAT takes action beyond the network layer.
IP packets have a checksum in each packet header, which provides error detection only for the header. IP datagrams may become fragmented and it is necessary for a NAT to reassemble these fragments to allow correct recalculation of higher-level checksums and correct tracking of which packets belong to which connection.
The major transport layer protocols, TCP and UDP, have a checksum that covers all the data they carry, as well as the TCP/UDP header, plus a "pseudo-header" that contains the source and destination IP addresses of the packet carrying the TCP/UDP header. For an originating NAT to pass TCP or UDP successfully, it must recompute the TCP/UDP header checksum based on the translated IP addresses, not the original ones, and put that checksum into the TCP/UDP header of the first packet of the fragmented set of packets. The receiving NAT must recompute the IP checksum on every packet it passes to the destination host, and also recognize and recompute the TCP/UDP header using the retranslated addresses and pseudo-header. This is not a completely solved problem. One solution is for the receiving NAT to reassemble the entire segment and then recompute a checksum calculated across all packets.
The originating host may performMaximum transmission unit(MTU)path discoveryto determine the packet size that can be transmitted without fragmentation, and then set the don't fragment(DF) bit in the appropriate packet header field. Of course, this is only a one- way solution, because the responding host can send packets of any size, which may be fragmented before reaching the NAT.
Question No: 12
Refer to the exhibit. Which two statements are true about the loopback address that is configured on RouterB? (Choose two.)
A. It ensures that data will be forwarded by RouterB.
B. It provides stability for the OSPF process on RouterB.
C. It specifies that the router ID for RouterB should be 10.0.0.1.
D. It decreases the metric for routes that are advertised from RouterB.
E. It indicates that RouterB should be elected the DR for the LAN.
Answer: B,C
Explanation:
A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) -
The router-ID is chosen in the order below:
+ The highest IP address assigned to a loopback (logical) interface.+ If a loopback interface is not defined, the highest IP address of all active routeru2021s physical interfaces will be chosen.
-> The loopback interface will be chosen as the router ID of RouterB u2013
Question No: 13
Which type of address is the public IP address of a NAT device?
A. outside global
B. outside local
C. inside global
D. inside local
E. outside public
F. inside public
Answer: C
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