Improved Cisco 100-105 practice test

Answer: C 

Answer:  

Answer: E 

Explanation: 

The RARP protocol is used to translate hardware interface addresses to protocol addresses. The RARP message format is very similar to the ARP format. When the booting computer sends the broadcast ARP request, it places its own hardware address in both the sending and receiving fields in the encapsulated ARP data packet. The RARP server will fill in the correct sending and receiving IP addresses in its response to the message. This way the booting computer will know its IP address when it gets the message from the RARP server 

Answer: B 

Explanation: 

A switch is a layer 2 device and doesn’t use network layer for packet forwarding. The IP 

address may be used only for administrative purposes such as Telnet access or for network management purposes. 

Answer: A 

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 

Answer: C 

Explanation: 

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00801 25913.shtml 

Each time you power up the switch, eight Power-On Self Tests (POSTs) run automatically. POSTs check the most important system components before the switch begins to forward packets. When the switch begins the POST, the port status LEDs display amber for two seconds, and then display green. As each test runs, the port status LEDs go out. 1x is the first to go out. The port status LEDs for ports 2x through 8x go out sequentially as the system completes a test. When the POST completes successfully, the port status LEDs go out. This indicates that the switch is operational. If a test fails, the port status LED associated with the test displays amber. The system LED also displays amber. Not E: From Cisco IOS Software Release 11.2(8.5) SA6 onwards, the port and system LEDs both remain amber after a POST failure. In the earlier Cisco IOS Software Releases, only the LEDs of failed linked ports remained amber. 

Answer: B,C 

Explanation: 

OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows: 

. LSA Type 1: Router LSA 

....... 

LSA Type 2: Network LSA 

LSA Type 3: Summary LSA 

LSA Type 4: Summary ASBR LSA 

LSA Type 5: Autonomous system external LSA 

LSA Type 6: Multicast OSPF LSA 

LSA Type 7: Not-so-stubby area LSA 

LSA Type 8: External attribute LSA for BGP 

If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router. 

All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non-backbone area. The area through which you configure the virtual link, known as a transit area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed. 

Answer: A 

Explanation: 

Subnet mask A i.e. 255.255.255.192 with CIDR of /26 which means 64 hosts per subnet which are sufficient to accommodate even the largest subnet of 50 hosts. 

Answer: A 

Explanation: 

Ethernet began as a local area network technology that provided a half-duplex shared channel for stations connected to coaxial cable segments linked with signal repeaters. In this appendix, we take a detailed look at the half-duplex shared-channel mode of operation, and at the CSMA/CD mechanism that makes it work. In the original half-duplex mode, the CSMA/CD protocol allows a set of stations to compete for access to a shared Ethernet channel in a fair and equitable manner. The protocol’s rules determine the behavior of Ethernet stations, including when they are allowed to transmit a frame onto a shared Ethernet channel, and what to do when a collision occurs. Today, virtually all devices are connected to Ethernet switch ports over full-duplex media, such as twisted-pair cables. On this type of connection, assuming that both devices can support the full-duplex mode of operation and that Auto-Negotiation (AN) is enabled, the AN protocol will automatically select the highest-performance mode of operation supported by the devices at each end of the link. That will result in full-duplex mode for the vast majority of Ethernet connections with modern interfaces that support full duplex and AN. 

Answer: B,C,D 

Explanation: 

The “network 192.168.12.64 0.0.0.63 equals to network 192.168.12.64/26. This network has: 

+

 Increment: 64 (/26= 1111 1111.1111 1111.1111 1111.1100 0000) 

+

 Network address: 192.168.12.64 

+

 Broadcast address: 192.168.12.127 

Therefore all interface in the range of this network will join OSPF.