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April 21, 2017

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Q91. - (Topic 5) 

The hosts in the LAN are not able to connect to the Internet. Which commands will correct this issue? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

E. Option E 

Answer:

Explanation: 

Do a “show ip int brief” and you will see that Fa0/1 has an IP address assigned, but it is shut down. 


Q92. - (Topic 2) 

Refer to the exhibit. 

The ports that are shown are the only active ports on the switch. The MAC address table is shown in its entirety. The Ethernet frame that is shown arrives at the switch. 

What two operations will the switch perform when it receives this frame? (Choose two.) 

A. The MAC address of 0000.00aa.aaaa will be added to the MAC address table. 

B. The MAC address of 0000.00dd.dddd will be added to the MAC address table. 

C. The frame will be forwarded out of port fa0/3 only. 

D. The frame will be forwarded out of fa0/1, fa0/2, and fa0/3. 

E. The frame will be forwarded out of all the active ports. 

Answer: A,D 

Explanation: 

If the switch already has the MAC address in its table for the destination, it will forward the frame directly to the destination port. If it was not already in its MAC table, then they frame would have been flooded out all ports except for the port that it came from. It will also add the MAC address of the source device to its MAC address table 


Q93. - (Topic 3) 

What is the network address for the host with IP address 192.168.23.61/28? 

A. 192.168.23.0 

B. 192.168.23.32 

C. 192.168.23.48 

D. 192.168.23.56 

E. 192.168.23.60 

Answer:

Explanation: 

Convert bit-length prefix to quad-dotted decimal representation, then from it find the number of bits used for subnetting you can find previously calculated number of subnets by separating subnets each having value of last bit used for subnet masking Find that your IP address is in which subnet, that subnet's first address is network address and last address is broadcast address. Based on above steps the answer is option C 


Q94. - (Topic 1) 

Which three statements are true about the operation of a full-duplex Ethernet network? (Choose three.) 

A. There are no collisions in full-duplex mode. 

B. A dedicated switch port is required for each full-duplex node. 

C. Ethernet hub ports are preconfigured for full-duplex mode. 

D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting. 

E. The host network card and the switch port must be capable of operating in full-duplex mode. 

Answer: A,B,E 

Explanation: 

Half-duplex Ethernet is defined in the original 802.3 Ethernet and Cisco says you only use one wire pair with a digital signal running in both directions on the wire. It also uses the CSMA/CD protocol to help prevent collisions and to permit retransmitting if a collision does occur. If a hub is attached to a switch, it must operate in half-duplex mode because the end stations must be able to detect collisions. Half-duplex Ethernet—typically 10BaseT—is only about 30 to 40 percent efficient as Cisco sees it, because a large 10BaseT network will usually only give you 3- to 4Mbps—at most. Full-duplex Ethernet uses two pairs of wires, instead of one wire pair like half duplex. Also, full duplex uses a point-to-point connection between the transmitter of the transmitting device and the receiver of the receiving device, which means that with full-duplex data transfer, you get a faster data transfer compared to half duplex. And because the transmitted data is sent on a different set of wires than the received data, no collisions occur. The reason you don’t need to worry about collisions is because now Full-duplex Ethernet is like a freeway with multiple lanes instead of the single-lane road provided by half duplex. Full-duplex Ethernet is supposed to offer 100 percent efficiency in both directions; this means you can get 20Mbps with a 10Mbps Ethernet running full duplex, or 200Mbps for FastEthernet. 


Q95. - (Topic 5) 

Select two options which are security Issues which need to be modified before RouterA is used? (Choose two.) 

A. unencrypted weak password is configured to protect privilege mode 

B. inappropriate wording in banner message 

C. the virtual terminal lines have a weak password configured 

D. virtual terminal lines have a password, but it will not be used 

E. configuration supports un-secure web server access 

Answer: B,D 


Q96. - (Topic 3) 

Refer to the graphic. 

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.) 

A. All of the routers need to be configured for backbone Area 1. 

B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3. 

C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established. 

D. The hello and dead interval timers are not set to the same values on R1 and R3. 

E. EIGRP is also configured on these routers with a lower administrative distance. 

F. R1 and R3 are configured in different areas. 

Answer: D,F 

Explanation: 

This question is to examine the conditions for OSPF to create neighborhood. 

So as to make the two routers become neighbors, each router must be matched with the 

following items: 

1.

 The area ID and its types; 

2.

 Hello and failure time interval timer; 

3.

 OSPF Password (Optional); 


Q97. - (Topic 5) 

Refer to the exhibit. 

The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three.) 

A. Ensure that the Ethernet encapsulations match on the interconnected router and switch ports. 

B. Ensure that cables A and B are straight-through cables. 

C. Ensure cable A is plugged into a trunk port. 

D. Ensure the switch has power. 

E. Reboot all of the devices. 

F. Reseat all cables. 

Answer: B,D,F 

Explanation: 

The ports on the switch are not up indicating it is a layer 1 (physical) problem so we should check cable type, power and how they are plugged in. 


Q98. - (Topic 2) 

A switch has 48 ports and 4 VLANs. How many collision and broadcast domains exist on the switch (collision, broadcast)? 

A. 4, 48 

B. 48, 4 

C. 48, 1 

D. 1, 48 

E. 4, 1 

Answer:

Explanation: 

A switch uses a separate collision domain for each port, and each VLAN is a separate broadcast domain. 

Topic 3, Routing Fundamentals 


Q99. - (Topic 3) 

Which command enables IPv6 forwarding on a Cisco router? 

A. ipv6 host 

B. ipv6 unicast-routing 

C. ipv6 local 

D. ipv6 neighbor 

Answer:

Explanation: 

Enabling IPv6 on Cisco IOS Software Technology http://www.ciscopress.com/articles/article.asp?p=31948&seqNum=4 The first step of enabling IPv6 on a Cisco router is the activation of IPv6 traffic forwarding to forward unicast IPv6 packets between network interfaces. By default, IPv6 traffic forwarding is disabled on Cisco routers. The ipv6 unicast-routing command is used to enable the forwarding of IPv6 packets between interfaces on the router. The syntax for this command is as follows: Router(config)#ipv6 unicast-routing The ipv6 unicast-routing command is enabled on a global basis. 


Q100. - (Topic 3) 

What does administrative distance refer to? 

A. the cost of a link between two neighboring routers 

B. the advertised cost to reach a network 

C. the cost to reach a network that is administratively set 

D. a measure of the trustworthiness of a routing information source 

Answer:

Reference: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml 

Administrative distance is the feature that routers use in order to select the best path when there are two or more different routes to the same destination from two different routing protocols. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. 

Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. The smaller the administrative distance value, the more reliable the protocol. 



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