How to pass icnd1 100 105 in Aug 2017

Ucertify offers free demo for ccent 100 105 pdf exam. “Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)”, also known as icnd1 100 105 pdf exam, is a Cisco Certification. This set of posts, Passing the Cisco cisco 100 105 exam, will help you answer those questions. The icnd1 100 105 Questions & Answers covers all the knowledge points of the real exam. 100% real Cisco cisco 100 105 exams and revised by experts!

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Q51. – (Topic 7) 

What is one requirement for interfaces to run IPv6? 

A. An IPv6 address must be configured on the interface. 

B. An IPv4 address must be configured. 

C. Stateless autoconfiguration must be enabled after enabling IPv6 on the interface. 

D. IPv6 must be enabled with the ipv6 enable command in global configuration mode. 

Answer:

Explanation: To use IPv6 on your router, you must, at a minimum, enable the protocol and assign IPv6 addresses to your interfaces. 

Q52. – (Topic 1) 

Refer to the exhibit. 

The exhibit is showing the topology and the MAC address table. Host A sends a data frame to host D. What will the switch do when it receives the frame from host A? 

A. The switch will add the source address and port to the MAC address table and forward the frame to host D. 

B. The switch will discard the frame and send an error message back to host A. 

C. The switch will flood the frame out of all ports except for port Fa0/3. 

D. The switch will add the destination address of the frame to the MAC address table and forward the frame to host D. 

Answer:

Explanation: 

When switch receives the data frame from the host not having the MAC address already on the MAC table, it will add the MAC address to source port on MAC address table and sends the data frame. 

Q53. – (Topic 5) 

Refer to the exhibit. 

Why was this message received? 

A. No VTY password has been set. 

B. No enable password has been set. 

C. No console password has been set. 

D. No enable secret password has been set. 

E. The login command has not been set on CON 0 

F. The login command has not been set on the VTY ports. 

Answer:

Explanation: 

Your CCNA certification exam is likely going to contain questions about Telnet, an application-level protocol that allows remote communication between two networking devices. With Telnet use being as common as it is, you had better know the details of how to configure it in order to pass your CCNA exam and to work in real-world networks. 

The basic concept is pretty simple – we want to configure R1, but we're at R2. If we telnet successfully to R1, we will be able to configure R1 if we've been given the proper permission levels. In this CCNA case study, R2 has an IP address of 172.12.123.2 and R1 an address of 172.12.123.1. Let's try to telnet from R2 to R1. 

R2#telnet 172.12.123.1 Trying 172.12.123.1 … Open Password required, but none set [Connection to 172.12.123.1 closed by foreign host] 

This seems like a problem, but it's a problem we're happy to have. A Cisco router will not let any user telnet to it by default. That's a good thing, because we don't want just anyone connecting to our router! The "password required" message means that no password has been set on the VTY lines on R1. Let's do so now. 

R1(config)#line vty 0 4 

R1(config-line)#password baseball 

A password of "baseball" has been set on the VTY lines, so we shouldn't have any trouble using Telnet to get from R2 to R1. Let's try that now. 

R2#telnet 172.12.123.1 

Trying 172.12.123.1 … Open 

User Access Verification 

Password: 

R1> 

We're in, and placed into user exec mode. 

Reference: 

http://www.mcmcse.com/cisco/guides/telnet_passwords_and_privilege_levels.shtml 

Q54. – (Topic 7) 

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:

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. 

Q55. – (Topic 5) 

An administrator has connected devices to a switch and, for security reasons, wants the dynamically learned MAC addresses from the address table added to the running configuration. 

What must be done to accomplish this? 

A. Enable port security and use the keyword sticky. 

B. Set the switchport mode to trunk and save the running configuration. 

C. Use the switchport protected command to have the MAC addresses added to the configuration. 

D. Use the no switchport port-security command to allow MAC addresses to be added to the configuration. 

Answer:

Explanation: 

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide 

/port_sec.pdf 

One can configure MAC addresses to be sticky. These can be dynamically learned or manually configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, the interface does not need to dynamically relearn them when the switch restarts, hence enabling security as desired. 

Q56. – (Topic 7) 

Which MTU size can cause a baby giant error? 

A. 1500 

B. 9216 

C. 1600 

D. 1518 

Answer:

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

Q57. – (Topic 1) 

On a Cisco switch, which protocol determines if an attached VoIP phone is from Cisco or from another vendor? 

A. RTP 

B. TCP 

C. CDP 

D. UDP 

Answer:

Explanation: 

The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. Cisco Discovery Protocol (CDP) is a proprietary protocol designed by Cisco to help administrators collect information about both locally attached and remote devices. By using CDP, you can gather hardware and protocol information about neighbor devices, which is useful info for troubleshooting the network. CDP messages are generated every 60 seconds as multicast messages on each of its active interfaces. The information shared in a CDP packet about a Cisco device includes the following: Name of the device configured with the hostname command IOS software version Hardware capabilities, such as routing, switching, and/or bridging Hardware platform, such as 2600, 2950, or 1900 The layer-3 address(es) of the device The interface the CDP update was generated on 

Reference: http://computernetworkingnotes.com/cisco-devices-administration-and-configuration/cisco-discoveryprotocol.html 

Q58. – (Topic 3) 

An administrator is working with the 192.168.4.0 network, which has been subnetted with a /26 mask. Which two addresses can be assigned to hosts within the same subnet? (Choose two.) 

A. 192.168.4.61 

B. 192.168.4.63 

C. 192.168.4.67 

D. 192.168.4.125 

E. 192.168.4.128 

F. 192.168.4.132 

Answer: C,D 

Explanation: 

Increment: 64 (/26 = 11111111.11111111.11111111.11000000) 

The IP 192.168.4.0 belongs to class C. The default subnet mask of class C is /24 and it has 

been subnetted with a /26 mask so we have 2(26-24).= 22.= 4 sub-networks: 

1st subnet: 192.168.4.0 (to 192.168.4.63) 

2nd subnet: 192.168.4.64 (to 192.168.4.127) 

3rd subnet: 192.168.4.128 (to 192.168.4.191) 

4th subnet: 192.168.4.192 (to 192.168.4.225) 

In all the answers above, only answer C and D are in the same subnet. 

Therefore only IPs in this range can be assigned to hosts. 

Q59. – (Topic 5) 

What is the subnet broadcast address of the LAN connected to Router1? 

A. 192.168.8.15 

B. 192.168.8.31 

C. 192.168.8.63 

D. 192.168.8.127 

Answer:

Explanation: 

The IP address assigned to FA0/1 is 192.168.8.9/29, making 192.168.8.15 the broadcast address. 

Q60. – (Topic 7) 

Which statement about static routes is true? 

A. The source interface can be configured to make routing decisions. 

B. A subnet mask is entered for the next-hop address. 

C. The subnet mask is 255.255 255.0 by default 

D. The exit interface can be specified to indicate where the packets will be routed. 

Answer:

Explanation: 

Static routing can be used to define an exit point from a router when no other routes are available or necessary. This is called a default route. 

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