Answer: D 

Explanation: 

The most useful thing to check on RTA would be the show interfaces command to see if the interface toward the WAN link is up. The most likely scenario is that the local LAN interface is up, but the other interface toward the XYZ company is down. 

Answer: B 

Explanation: 

A broadcast storm can consume sufficient network resources so as to render the network unable to transport normal traffic. 

Topic 6, Simulation 

Answer: D 

Explanation: 

http://www.cisco.com/en/US/tech/tk962/technologies_tech_note09186a00801aa000.shtml# topicenab 

When CDP is enabled globally using the cdp run command, it is enabled by default on all supported interfaces (except for Frame Relay multipoint subinterfaces) to send and receive CDP information. You can disable CDP on an interface that supports CDP with the no cdp enable command. 

Router#show cdp neighbors 

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r – Repeater 

Router# On this router, CDP is enabled on Serial 1 and Ethernet 0 interfaces. Disable CDP on the Serial 1 interface and verify if the neighbor device is discovered on the serial 1 interface, as this output shows: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#interface s1 Router(config-if)#no cdp enable Router(config-if)# Z Router#4w5D. %SYS-5-CONFIG_I: Configured from console by console 

Answer: D 

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 

Answer: C 

Explanation: 

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

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 

Answer: C 

Explanation: 

TCP is an example of a connection-oriented protocol. It requires a logical connection to be established between the two processes before data is exchanged. The connection must be maintained during the entire time that communication is taking place, then released afterwards. The process is much like a telephone call, where a virtual circuit is established--the caller must know the person's telephone number and the phone must be answered--before the message can be delivered. TCP/IP is also a connection-oriented transport with orderly release. With orderly release, any data remaining in the buffer is sent before the connection is terminated. The release is accomplished in a three-way handshake between client and server processes. The connection-oriented protocols in the OSI protocol suite, on the other hand, do not support orderly release. Applications perform any handshake necessary for ensuring orderly release. Examples of services that use connection-oriented transport services are telnet, rlogin, and ftp. 

Answer: C 

Explanation: 

From the /28 we can get the following: 

Increment: 16 (/28 = 11111111.11111111.11111111.11110000) 

Network address: 172.19.20.16 (because 16 < 23) 

Broadcast address: 172.16.20.31 (because 31 = 16 + 16 – 1) 

Answer: A 

Explanation: Link State Routing Protocols 

Link state protocols are also called shortest-path-first protocols. Link state routing protocols have a complete picture of the network topology. Hence they know more about the whole network than any distance vector protocol. Three separate tables are created on each link state routing enabled router. One table is used to hold details about directly connected neighbors, one is used to hold the topology of the entire internetwork and the last one is used to hold the actual routing table. Link state protocols send information about directly connected links to all the routers in the network. Examples of Link state routing protocols include OSPF - Open Shortest Path First and IS-IS - Intermediate System to Intermediate System. There are also routing protocols that are considered to be hybrid in the sense that they use aspects of both distance vector and link state protocols. EIGRP - Enhanced Interior Gateway Routing Protocol is one of those hybrid routing protocols. 

Answer: C 

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.”