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Q91. - (Topic 3) 

Some routers have been configured with default routes. What are some of the advantages 

of using default routes? (Choose two) 

A. They establish routes that will never go down. 

B. They keep routing tables small. 

C. They require a great deal of CPU power. 

D. They allow connectivity to remote networks that are not in the routing table 

E. They direct traffic from the internet into corporate networks. 

Answer: B,D 

Explanation: 

Cisco administration 101: What you need to know about default routes Reference: 

http://www.techrepublic.com/article/cisco-administration-101-what-you-need-to-know-about-default-routes/ 


Q92. - (Topic 1) 

What are two common TCP applications? (Choose two.) 

A. TFTP 

B. SMTP 

C. SNMP 

D. FTP 

E. DNS 

Answer: B,D 

Explanation: 

SMTP uses TCP port 25, while FTP uses TCP ports 20 and 21. 

Reference: http://pentestlab.wordpress.com/2012/03/05/common-tcpip-ports/ 


Q93. - (Topic 3) 

Which IOS command is used to initiate a login into a VTY port on a remote router? 

A. router# login 

B. router# telnet 

C. router# trace 

D. router# ping 

E. router(config)# line vty 0 5 

F. router(config-line)# login 

Answer:

Explanation: 

VTY ports are telnet ports hence command B will initiate login to the telnet port. 


Q94. - (Topic 7) 

Which component of the routing table ranks routing protocols according to their preferences? 

A. administrative distance 

B. next hop 

C. metric 

D. routing protocol code 

Answer:

Explanation: 

Administrative distance - This is the measure of trustworthiness of the source of the 

route. If a router learns about a destination from more than one routing protocol, 

administrative distance is compared and the preference is given to the routes with lower 

administrative distance. In other words, it is the believability of the source of the route. 


Q95. - (Topic 4) 

The network administrator is using a Windows PC application that is called putty.exe for remote communication to a switch for network troubleshooting. Which two protocols could be used during this communication? (Choose two.) 

A. SNMP 

B. HTTP 

C. Telnet 

D. RMON 

E. SSH 

Answer: C,E 

Explanation: 

PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, and is used to connect to Cisco and other networking devices using SSH or Telnet. 

Topic 5, Infrastructure Maintenance 


Regenerate 100-105 exam guide:

Q96. - (Topic 7) 

Which value is indicated by the next hop in a routing table? 

A. preference of the route source 

B. IP address of the remote router for forwarding the packets 

C. how the route was learned 

D. exit interface IP address for forwarding the packets 

Answer:

Explanation: 

The routing table contains network/next hop associations. These associations tell a router that a particular destination can be optimally reached by sending the packet to a specific router that represents the "next hop" on the way to the final destination. The next hop association can also be the outgoing or exit interface to the final destination. 


Q97. - (Topic 5) 

Refer to the exhibit. 

The network administrator is testing connectivity from the branch router to the newly installed application server. What is the most likely reason for the first ping having a success rate of only 60 percent? 

A. The network is likely to be congested, with the result that packets are being intermittently dropped. 

B. The branch router had to resolve the application server MAC address. 

C. There is a short delay while NAT translates the server IP address. 

D. A routing table lookup delayed forwarding on the first two ping packets. 

E. The branch router LAN interface should be upgraded to FastEthernet. 

Answer:

Explanation: 

Initially the MAC address had to be resolved, but once it is resolved and is in the ARP table of the router, pings go through immediately. 


Q98. - (Topic 3) 

An administrator must assign static IP addresses to the servers in a network. For network 192.168.20.24/29, the router is assigned the first usable host address while the sales server is given the last usable host address. 

Which of the following should be entered into the IP properties box for the sales server? 

A. IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9 

B. IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1 

C. IP address: 192.168.20.30 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.25 

D. IP address: 192.168.20.30 Subnet Mask: 255.255.255.240 Default Gateway: 192.168.20.17 

E. IP address: 192.168.20.30 Subnet Mask: 255.255.255.240 Default Gateway: 192.168.20.25 

Answer:

Explanation: 

With network 192.168.20.24/29 we have: 

Increment: 8 (/29 = 255.255.255.248 = 11111000 for the last octet) 

Network address: 192.168.20.24 (because 24 = 8 * 3) 

Broadcast address: 192.168.20.31 (because 31 = 24 + 8 – 1) 

Therefore the first usable IP address is 192.168.20.25 (assigned to the router) and the last usable IP address is 192.168.20.30 (assigned to the sales server). The IP address of the router is also the default gateway of the sales server. 


Q99. - (Topic 3) 

Refer to the exhibit. 

Why are two OSPF designated routers identified on Core-Router? 

A. Core-Router is connected to more than one multi-access network. 

B. The router at 208.149.23.130 is a secondary DR in case the primary fails. 

C. Two router IDs have the same OSPF priority and are therefore tied for DR election 

D. The DR election is still underway and there are two contenders for the role. 

Answer:

Explanation: 

OSPF elects one DR per multi-access network. In the exhibit there are two DR so there must have more than one multi-access network. 


Q100. - (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