More CCNA Questions

Q. Which ISDN Q-series specification defines the LAPD protocol used on the D channel to encapsulate signaling requests?
Ans : ITU-T Q.920 and ITU-T Q.921 define the LAPD protocol used on the D channel to encapsulate signaling requests

Q. How can we prevent receiving the following message and the delay for it to time out? R2#ping www.freetest.com Translating "www.freetest.com"...domain server (255.255.255.255) % Unrecognized host or address, or protocol not running.
Ans : When entering a hostname instead of an IP address the router will try to find a dns server to resolve this hostname. The behaviour is enabled by default with the ip domain-lookup command, if we want to disable this we use the no form of the command.
(config)# no ip domain-lookup

Q. A port forwarding the lowest-cost BPDU on a LAN segment is the ------ (designated) port.

Q. How do we configure our ISDN interface so that the call is torn down after 15 seconds of no incoming or outgoing traffic?

More CCNA Questions

• Which ISDN Q-series specification defines the LAPD protocol used on the D channel to encapsulate signalling requests?
  Ans: 1) ITU-T Q.920    2) ITU-T Q.921



• We want to include 6 equal-cost routes to the same subnet in the routing table. How do we achieve this?
  Ans: maximum-paths 6
  The maximum-paths command will include equal-cost routes to the same subnet in the routing table. By default Cisco IOS includes upto 4 equal-cost routes in the routing table, if we need more or less we use maxim-paths nr_of_paths.



• Given the network range 192.168.1.0/24 to 192.168.32.0/24. How many summary routes will be advertised?
  Ans: One.
  We have a block of 32 networks so we can replace this range using route summarization.
  Let's have a look at the 3rd otcet in binary.
  1 0000 0001 2 0000 0010 ... 10 0000 1010 ... 32 0010 0000 Now we can see that the first 2 bits are always the same, so we can now derive a supernet mask for this block. The first two octets are the same and so are the first two bits of the third octet, this will become all 1s in the supernet mask or 1111 1111.1111 1111.1100 0000.0000 0000 or 255.255.192.0. So the route advertised is 192.168.1.0/18



• The administrative distance of OSPF is?
  Ans: 110.
  For other routing protocols, The other values are
  Connected Interface   -   0
  Static Route   -   1
  EIGRP Summary Route   -   5
  External BGP   -   20
  Internal EIGRP   -   90
  IGRP   -   100
  OSPF   -   110
  IS-IS   -   115
  RIP   -   120
  EGP   -   140
  On Demand Routing   -   160
  External EIGRP   -   170
  Internal BGP   -   200

Five Questions on OSPF and EIGRP concepts

• What is the multicast address of Hello protocols for all SPF Routers?
  Ans: 224.0.0.5


• Which four items are listed after a Show ip ospf interface command?
  Ans: Any neighbor's known on each interface,
  The area number,
  The cost, and
  Timers including the Helo and Dead Timer


• Which command will summarize 10.0.0.0 for EIGRP AS 100?
  Ans: ip summary-address eigrp 100 10.0.0.0 255.0.0.0


• Which two parameters will affect the calculation of EIGRP metrics when all possible default values are used?
  Ans:   Bandwidth and Delay


• Which of the following affects the calculation of OSPF routes when all possible default values are used?
  Ans:   Bandwidth

Five more questions on Basic Router Configuration

• Which line sub command tells the router not to interrupt the output of a show command with unsolicited messages ?
  Ans: logging synchronous


• Within telnet the show sessions command lists the current and suspended sessions.Which other command does the same thing?
  Ans: where


• What three features can be configured on a cisco router in setup mode?
  Ans: IP address,   Enable Passwords,   Routed protocols


• You telnet to a host on a remote network.Which MAC address will be present in the ARP table when you issue the show arp command?
  Ans:   MAC address of the local router ethernet port.


• Your Boss has asked you to send him a bulleted list on CDP. Which five useful details from neighbouring devices will be on that list?
  Ans:   Device Identifier - Typically the host name.
  Address List - Network and datalink addresses
  Port Identifier - Text that identifies the port which is another name for an inetrface
  Capablities List - Information on what type of device it is - for example a router or a switch.
  Platform - The model and OS running on that device.