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New Cisco 100-105 Exam Dumps Collection (Question 8 - Question 17)

Q1. The internetwork shown in the diagram is experiencing network connectivity problems.

What is the cause of the problem?

A. The cabling connecting host A to Switch3 is too long.

B. The address of host B is a broadcast address.

C. The IP address of interface Fa0/0 of Router1 is not a usable address.

D. The cable connecting Switch2 and Switch3 should be a crossover.

E. The IP address of Server 1 is in the wrong subnet.

Answer: D



Q2. Which information is used to install the best route to a destination in IP routing table?

A. the tunnel ID

B. the prefix length

C. the interface number

D. the autonomous system

Answer: B



Q3. Which router command can be used to determine the status of Serial 0/0?

A. show ip route

B. show interfaces

C. show s0/0 status

D. debug s0/0

E. show run

F. show version

Answer: B



Q4. Scenario:

You work for a company that provides managed network services, and of your real estate clients running a small office is experiencing network issues, Troubleshoot the network issues.

Router R1 connects the main office to internet, and routers R2 and R3 are internal routers NAT is enabled on Router R1.

The routing protocol that is enable between routers R1, R2, and R3 is RIPv2.

R1 sends default route into RIPv2 for internal routers to forward internet traffic to R1. Server1 and Server2 are placed in VLAN 100 and 200 respectively, and dare still running

router on stick configuration with router R2.

You have console access on R1, R2, R3, and L2SW1 devices. Use only show commands to troubleshoot the issues.

Examine R2 configuration, the traffic that is destined to R3 LAN network sourced from Router R2 is forwarded to R1 instead R3. What could be an issue?

A. RIPv2 routing updates are suppressed between R2 and R3 using passive interface feature.

B. RIPv2 enabled on R3, but R3 LAN network that is not advertised into RIPv2 domain.

C. No issue that is identified; this behavior is normal since default route propagated into RIPv2 domain by Router R1.

D. RIPv2 not enabled on R3.

Answer: D



Q5. Refer to the exhibit.

A network technician has added host A to the network. Host A cannot communicate on the network. A ping that is issued on the host to address 127.0.0.1 fails. What is the problem?

A. The router is not forwarding the ping packets to network 127.0.0.0.

B. The remote host at 127.0.0.1 is unreachable.

C. The default gateway is incorrect.

D. The IP address of host A is incorrect.

E. The TCP/IP protocols are not loaded.

Answer: E



Q6. Which MTU size can cause a baby giant error?

A. 1500

B. 9216

C. 1600

D. 1518

Answer: D

Explanation: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html



Q7. Two hosts are attached to a switch with the default configuration. Which statement about the configuration is true?

A. IP routing must be enabled to allow the two hosts to communicate.

B. The two hosts are in the same broadcast domain.

C. The switch must be configured with a VLAN to allow the two hosts to communicate.

D. Port security prevents the hosts from connecting to the switch.

Answer: B

Explanation: http://www.cisco.com/c/en/us/support/docs/lan-switching/inter-vlan-routing/41860-howto-L3-intervlanrouting.html



Q8. 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 as ICMP, 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 as TCP and UDP, 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 perform Maximum transmission unit (MTU) path discovery to 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.



Q9. WAN data link encapsulation types include which of the following? (Choose two.)

A. T1

B. Frame Relay

C. DSL

D. PPP

E. ISDN

Answer: B,D



Q10. Refer to the exhibit.

What value should be displayed in Box 1 of the ipconfig output of host A?

A. 172.18.14.5

B. 172.18.14.6

C. 192.168.1.10

D. 192.168.1.11

E. 192.168.1.250

F. 192.168.1.254

Answer: F




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