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Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)

Question No: 71 – (Topic 3)


Refer to the topology. Your company has decided to connect the main office with three

other remote branch offices using point-to-point serial links.

You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.









R1 does not form an OSPF neighbor adjacency with R2. Which option would fix the issue?

  1. R1 ethernetO/1 is shutdown. Configure no shutdown command.

  2. R1 ethernetO/1 configured with a non-default OSPF hello interval of 25: configure no ip ospf hello-interval 25

  3. R2 ethernetO/1 and R3 ethernetO/O are configured with a non-default OSPF hello

    interval of 25; configure no ip ospf hello-interval 25

  4. Enable OSPF for R1 ethernetO/1; configure ip ospf 1 area 0 command under ethernetO/1

Answer: B Explanation:

Looking at the configuration of R1, we see that R1 is configured with a hello interval of 25 on interface Ethernet 0/1 while R2 is left with the default of 10 (not configured).


Question No: 72 – (Topic 3)

Which two of these statements are true of IPv6 address representation? (Choose two.)

  1. There are four types of IPv6 addresses: unicast, multicast, anycast, and broadcast.

  2. A single interface may be assigned multiple IPv6 addresses of any type.

  3. Every IPv6 interface contains at least one loopback address.

  4. The first 64 bits represent the dynamically created interface ID.

  5. Leading zeros in an IPv6 16 bit hexadecimal field are mandatory.

Answer: B,C


A single interface may be assigned multiple addresses of any type (unicast, anycast, multicast).

Every IPv6-enabled interface must contain at least one loopback and one link-local address.

Optionally, every interface can have multiple unique local and global addresses. IPv6 host addresses can be assigned in multiple ways:

Static configuration Stateless autoconfiguration DHCPv6

When IPv6 is used over Ethernet networks, the Ethernet MAC address can be used to generate the 64-bit interface ID for the host. This is called the EUI-64 address.

Since MAC addresses use 48 bits, additional bits must be inserted to fill the 64 bits required.

Reference: http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf

Question No: 73 – (Topic 3)

R1 is configured with the default configuration of OSPF. From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID?






Answer: A Explanation:

The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequencE.

The highest IP address assigned to a loopback (logical) interface. If a loopback interface is not defined, the highest IP address of all active router#39;s physical interfaces will be chosen.

The router ID can be manually assigned

In this case, because a loopback interface is not configured so the highest active IP address is chosen as the router ID.

Question No: 74 – (Topic 3)

Some routers have been configured with default routes. What are some of the advantages of using default routes? (Choose two)

  1. They establish routes that will never go down.

  2. They keep routing tables small.

  3. They require a great deal of CPU power.

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

  5. 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/

Question No: 75 – (Topic 3)

What two things does a router do when it forwards a packet? (Choose two.)

  1. switches the packet to the appropriate outgoing interfaces

  2. computes the destination host address

  3. determines the next hop on the path

  4. updates the destination IP address

  5. forwards ARP requests

Answer: A,C Explanation:

A primary function of a router is to forward packets toward their destination. This is accomplished by using a switching function, which is the process used by a router to accept a packet on one interface and forward it out of another interface. A key responsibility of the switching function is to encapsulate packets in the appropriate data link frame type for the outgoing data link and determining the next hop device to send the frame to.

Question No: 76 – (Topic 3)

Refer to the exhibit.


What is the simplest way to configure routing between the regional office network and the corporate network?

A. router1(config)#ip route

B. router2(config)#ip route

C. router1(config)#ip route

D. router2(config)#ip route

Answer: D Explanation:

The next hop of the static route should be, which is the IP address for router R1 in this example. Since this router is a stub router with only a single connection to the WAN, the simplest thing to do is to configure a single static default route back to the HQ network.

Question No: 77 – (Topic 3)

Which statements are TRUE regarding Internet Protocol version 6 (IPv6) addresses? (Choose three.)

  1. An IPv6 address is divided into eight 16-bit groups.

  2. A double colon (::) can only be used once in a single IPv6 address.

  3. IPv6 addresses are 196 bits in length.

  4. Leading zeros cannot be omitted in an IPv6 address.

  5. Groups with a value of 0 can be represented with a single 0 in IPv6 address.

Answer: A,B,E Explanation:

IPv6 addresses are divided into eight 16-bit groups, a double colon (::) can only be used once in an IPv6 address, and groups with a value of 0 can be represented with a single 0 in an IPv6 address.

The following statements are also true regarding IPv6 address: IPv6 addresses are 128 bits in length.

Eight 16-bit groups are divided by a colon (:).

Multiple groups of 16-bit 0s can be represented with double colon (::). Double colons (::) represent only 0s.

Leading zeros can be omitted in an IPv6 address.

The option stating that IPv6 addresses are 196 bits in length is incorrect. IPv6 addresses are 128 bits in length.

The option stating that leading zeros cannot be omitted in an IPv6 address is incorrect. Leading zeros can be omitted in an IPv6 address.

Question No: 78 – (Topic 3)

If an Ethernet port on a router was assigned an IP address of, what is the maximum number of hosts allowed on this subnet?

A. 1024

B. 2046

C. 4094

D. 4096

E. 8190

Answer: C Explanation:

Each octet represents eight bits. The bits, in turn, represent (from left to right): 128, 64, 32 , 16 , 8, 4, 2, 1

Add them up and you get 255. Add one for the all zeros option, and the total is 256. Now, take away one of these for the network address (all zeros) and another for the broadcast address (all ones). Each octet represents 254 possible hosts. Or 254 possible

networks. Unless you have subnet zero set on your network gear, in which case you could conceivably have 255.

The CIDR addressing format (/20) tells us that 20 bits are used for the network portion, so

the maximum number of networks are 2^20 minus one if you have subnet zero enabled, or minus 2 if not.

You asked about the number of hosts. That will be 32 minus the number of network bits, minus two. So calculate it as (2^(32-20))-2, or (2^12)-2 = 4094

Question No: 79 – (Topic 3)

Which statement is true?

  1. An IPv6 address is 64 bits long and is represented as hexadecimal characters.

  2. An IPv6 address is 32 bits long and is represented as decimal digits.

  3. An IPv6 address is 128 bits long and is represented as decimal digits.

  4. An IPv6 address is 128 bits long and is represented as hexadecimal characters.

Answer: D Explanation:

http://www.cisco.com/en/US/technologies/tk648/tk872/technologies_white_paper0900aecd 8026003d.pdf

One of the key advantages IPv6 brings is the exponentially larger address space. The following will outline the basic address architecture of IPv6.

128-bit-long addresses Represented in hexadecimal format:

Uses CIDR principles: prefix/prefix length x:x:x:x:x:x:x:x, where x is a 16-bit hex field The last 64 bits are used for the interface ID

Question No: 80 – (Topic 3)

Which two commands will display the current IP address and basic Layer 1 and 2 status of an interface? (Choose two.)

  1. router#show version

  2. router#show ip interface

  3. router#show protocols

  4. router#show controllers

  5. router#show running-config

Answer: B,C Explanation:

The outputs of 鈥渟how protocols鈥?and 鈥渟how ip interface鈥?are shown below:

Global values:Internet Protocol routing is enabledSerial0/0 is up, line protocol is downInternet address is is up, line protocol is downInternet address is is up, line protocol is downSerial0/3 is up, line protocol is downNVI0 is up, line protocol is upInterface is unnumbered. Using address of NVI0 ( is up, line protocol is upInternet address is is up, line protocol is upInternet address is is up, line protocol is up

Serial0/0 is up, line protocol is downInternet address is address is determined by non-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is disabledMulticast reserved groups joined: access list is not setInbound access list is not setProxy ARP is enabledLocal Proxy ARP is disabledSecurity level is defaultSplit horizon is disabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the same interface is enabledIP Flow switching is disabledIP CEF switching is disabledIP Feature Fast switching turbo vectorIP multicast fast switching is enabledIP multicast distributed fast switching is disabledIP route- cache flags are FastRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting is disabledTCP/IP header compression is disabledRTP/IP header compression is disabledPolicy routing is disabledNetwork address translation is enabled, interface in domain insideBGP Policy Mapping is disabledWCCP Redirect outbound is disabledWCCP Redirect inbound is disabledWCCP Redirect exclude is disabled

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