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2017 Apr 100-105 test

Q1. - (Topic 5) 

Refer to the exhibit. 

An administrator replaced the 10/100 Mb NIC in a desktop PC with a 1 Gb NIC and now the PC will not connect to the network. The administrator began troubleshooting on the switch. Using the switch output shown, what is the cause of the problem? 

A. Speed is set to 100Mb/s. 

B. Input flow control is off. 

C. Encapsulation is set to ARPA. 

D. The port is administratively down. 

E. The counters have never been cleared. 

Answer:

Explanation: 

For PC to switch connectivity, the speed settings must match. In this case, the 1 Gb NIC will not be able to communicate with a 100Mb fast Ethernet interface, unless the 1Gb NIC can be configured to connect at 100Mb. 


Q2. - (Topic 7) 

Which method does a connected trunk port use to tag VLAN traffic? 

A. IEEE 802 1w 

B. IEEE 802 1D 

C. IEEE 802 1Q 

D. IEEE 802 1p 

Answer:

Explanation: 

http://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html 


Q3. - (Topic 5) 

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:

Explanation: 

If we use 172.16.20.0 to route to 172.16.150.15, then the packet will route back. To clear this error we have to use.#no ip route 172.16.20.0 255.255.255.0 172.16.150.15

.command in configuration mode. 


Q4. - (Topic 3) 

Which command is used to display the collection of OSPF link states? 

A. show ip ospf link-state 

B. show ip ospf lsa database 

C. show ip ospf neighbors 

D. show ip ospf database 

Answer:

Explanation: 

The “show ip ospf database” command displays the link states. Here is an example: 

Here is the lsa database on R2. 

R2#show ip ospf database 

OSPF Router with ID (2.2.2.2) (Process ID 1) 

Router Link States (Area 0) 

Link ID ADV Router Age Seq# Checksum Link count 

2.2.2.2 2.2.2.2 793 0x80000003 0x004F85 2 

10.4.4.4 10.4.4.4 776 0x80000004 0x005643 1 

111.111.111.111 111.111.111.111 755 0x80000005 0x0059CA 2 

133.133.133.133 133.133.133.133 775 0x80000005 0x00B5B1 2 Net Link States (Area 0) Link ID ADV Router Age Seq# Checksum10.1.1.1 111.111.111.111 794 0x80000001 0x001E8B 

10.2.2.3 133.133.133.133 812 0x80000001 0x004BA9 

10.4.4.1 111.111.111.111 755 0x80000001 0x007F16 

10.4.4.3 133.133.133.133 775 0x80000001 0x00C31F 


Q5. - (Topic 5) 

Which of the following is true regarding the configuration of SwitchA? 

A. only 5 simultaneous remote connections are possible 

B. remote connections using ssh will require a username and password 

C. only connections from the local network will be possible 

D. console access to SwitchA requires a password 

Answer:


Replace 100-105 practice:

Q6. - (Topic 3) 

A network administrator is trying to add a new router into an established OSPF network. The networks attached to the new router do not appear in the routing tables of the other OSPF routers. Given the information in the partial configuration shown below, what configuration error is causing this problem? 

Router(config)# router ospf 1 

Router(config-router)# network 10.0.0.0 255.0.0.0 area 0 

A. The process id is configured improperly. 

B. The OSPF area is configured improperly. 

C. The network wildcard mask is configured improperly. 

D. The network number is configured improperly. 

E. The AS is configured improperly. 

F. The network subnet mask is configured improperly. 

Answer:

Explanation: 

When configuring OSPF, the mask used for the network statement is a wildcard mask similar to an access list. In this specific example, the correct syntax would have been “network 10.0.0.0 0.0.0.255 area 0.” 


Q7. - (Topic 1) 

A network administrator is connecting PC hosts A and B directly through their Ethernet interfaces as shown in the graphic. Ping attempts between the hosts are unsuccessful. What can be done to provide connectivity between the hosts? (Choose two.) 

A. A crossover cable should be used in place of the straight-through cable. 

B. A rollover cable should be used in place of the straight-through cable. 

C. The subnet masks should be set to 255.255.255.192 

D. A default gateway needs to be set on each host. 

E. The hosts must be reconfigured to use private IP addresses for direct connections of this type. 

F. The subnet masks should be set to 255.255.255.0 

Answer: A,F 

Explanation: 

If you need to connect two computers but you don't have access to a network and can't set up an ad hoc network, you can use an Ethernet crossover cable to create a direct cable connection. Generally speaking, a crossover cable is constructed by reversing (or crossing over) the order of the wires inside so that it can connect two computers directly. A crossover cable looks almost exactly like a regular Ethernet cable (a straight-through cable), so make sure you have a crossover cable before following these steps. 

Both devices need to be on the same subnet, and since one PC is using 192.1.1.20 and the other is using 192.1.1.201, the subnet mask should be changed to 255.255.255.0. 


Q8. - (Topic 3) 

Which three approaches can be used while migrating from an IPv4 addressing scheme to an IPv6 scheme? (Choose three) 

A. static mapping of IPv4 address to IPv6 addresses 

B. configuring IPv4 tunnels between IPv6 islands 

C. use DHCPv6 to map IPv4 addresses to IPv6 addresses 

D. use proxying and translation (NAT-PT) to translate IPv6 packets into IPv4 packets 

E. configure IPv6 directly 

F. enable dual-stack routing 

Answer: B,D,F 

Explanation: 

Connecting IPv6 islands with tunnels An IPv6 island is a network made of IPv6 links directly connected by IPv6 routers. In the early days of IPv6 deployment, there are many IPv6 islands. IPv6 in IPv4 tunnels are used to connect those islands together. In each island, one (or more) dual stack routers are designated to encapsulate and decapsulate IPv6 packets within IPv4 packets. Different mechanisms have been developed to manage tunnels: automatic tunnels3, configured tunnels3, tunnel brokers3, 6over43, 6to43,... Reference 2: http://www.petri.co.il/ipv6-transition.htm Network Address Translation - Protocol Translation (NAT-PT) The NAT-PT method enables the ability to either statically or dynamically configure a translation of a IPv4 network address into an IPv6 network address and vice versa. For those familiar with more typically NAT implementations, the operation is very similar but includes a protocol translation function. NAT-PT also ties in an Application Layer Gateway (ALG) functionality that converts Domain Name System (DNS) mappings between protocols. 

Dual Stack The simplest approach when transitioning to IPv6 is to run IPv6 on all of the devices that are currently running IPv4. If this is something that is possible within the organizational network, it is very easy to implement. However, for many organizations, IPv6 is not supported on all of the IPv4 devices; in these situations other methods must be considered. 

Reference: http://www.opus1.com/ipv6/howdoitransitiontoipv6.html 


Q9. - (Topic 3) 

A network administrator is troubleshooting the OSPF configuration of routers R1 and R2. The routers cannot establish an adjacency relationship on their common Ethernet link. 

The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2. Based on the information in the graphic, what is the cause of this problem? 

A. The OSPF area is not configured properly. 

B. The priority on R1 should be set higher. 

C. The cost on R1 should be set higher. 

D. The hello and dead timers are not configured properly. 

E. A backup designated router needs to be added to the network. 

F. The OSPF process ID numbers must match. 

Answer:

Explanation: 

In OSPF, the hello and dead intervals must match and here we can see the hello interval is set to 5 on R1 and 10 on R2. The dead interval is also set to 20 on R1 but it is 40 on R2. 


Q10. - (Topic 1) 

Refer to the exhibit. 

What kind of cable should be used to make each connection that is identified by the numbers shown? 

A. 1 - Ethernet Crossover cable 2 - Ethernet straight-through cable 3 - Fiber Optic cable 4 - Rollover cable 

B. 1 - Ethernet straight-through cable 2 - Ethernet straight-through cable 3 - Serial cable 4 - Rollover cable 

C. 1 - Ethernet rollover cable 2 - Ethernet crossover cable 3 - Serial cable 4 - Null-modem cable 

D. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Rollover cable 

E. 1 - Ethernet straight-through cable 2 - Ethernet Crossover cable 3 - Serial cable 4 - Ethernet Straight-through cable 

Answer:

Explanation: 

When connecting a PC to a switch, a standard Ethernet straight through cable should be used. This same cable should also be used for switch to router connections. Generally 

speaking, crossover cables are only needed when connecting two like devices (PC-PC, 

switch-switch, router-router, etc). 

Routers connect to frame relay and other WAN networks using serial cables. 

Rollover cables are special cables used for connecting to the console ports of Cisco 

devices.