Cisco Interconnecting Cisco Networking Devices Part 1 (ICND1 v3.0)
Question No: 121 – (Topic 3)
What is the default maximum number of equal-cost paths that can be placed into the
routing table of a Cisco OSPF router?
Answer: B Explanation:
To control the maximum number of parallel routes that Open Shortest Path First (OSPF) can support, use the maximum-paths command.
Maximum number of parallel routes that OSPF can install in a routing table. The range is from 1 to 16 routes.
Question No: 122 – (Topic 3)
What information can be used by a router running a link-state protocol to build and maintain its topological database? (Choose two.)
SAP messages sent by other routers
LSAs from other routers
beacons received on point-to-point links
routing tables received from other link-state routers
TTL packets from designated routers
Answer: A,C Explanation: Reference 1:
Link state protocols, sometimes called shortest path first or distributed database protocols, are built around a well-known algorithm from graph theory, E. W. Dijkstra#39;a shortest path algorithm. Examples of link state routing protocols are:
Open Shortest Path First (OSPF) for IP
The ISO#39;s Intermediate System to Intermediate System (IS-IS) for CLNS and IP DEC#39;s DNA Phase V
Novell#39;s NetWare Link Services Protocol (NLSP)
Although link state protocols are rightly considered more complex than distance vector protocols, the basic functionality is not complex at all:
Each router establishes a relationship-an adjacency-with each of its neighbors.
Each router sends link state advertisements (LSAs), some
Each router stores a copy of all the LSAs it has seen in a database. If all works well, the databases in all routers should be identical.
The completed topological database, also called the link state database, describes a graph of the internetwork. Using the Dijkstra algorithm, each router calculates the shortest path to each network and enters this information into the route table.
Question No: 123 – (Topic 3)
Which option is a valid IPv6 address?
Answer: D Explanation:
IPv6 Address Notation
IPv6 addresses are denoted by eight groups of hexadecimal quartets separated by colons in between them.
Following is an example of a valid IPv6 address: 2001:cdba:0000:0000:0000:0000:3257:9652
Any four-digit group of zeroes within an IPv6 address may be reduced to a single zero or
Therefore, the following IPv6 addresses are similar and equally valid: 2001:cdba:0000:0000:0000:0000:3257:9652
Question No: 124 – (Topic 3)
What is the subnet address for the IP address 172.19.20.23/28?
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 lt; 23)
Broadcast address: 172.16.20.31 (because 31 = 16 16 – 1)
Question No: 125 – (Topic 3)
Which command can you use to manually assign a static IPV6 address to a router interface?
A. ipv6 address PREFIX_1::1/64
B. ipv6 autoconfig 2001:db8:2222:7272::72/64
C. ipv6 autoconfig
D. ipv6 address 2001:db8:2222:7272::72/64
Answer: D Explanation:
An example of configuring IPv6 on an interface is shown below: Router(config)# interface fastethernet 0/1
Router(config-if)# ipv6 address 3000::2222:1/64
Question No: 126 – (Topic 3)
Which router command will configure an interface with the IP address 10.10.80.1/19?
router(config-if)# ip address 10.10.80.1/19
router(config-if)# ip address 10.10.80.1 255.255.0.0 C. router(config-if)# ip address 10.10.80.1 255.255.255.0 D. router(config-if)# ip address 10.10.80.1 255.255.224.0 E. router(config-if)# ip address 10.10.80.1 255.255.240.0
F. router(config-if)# ip address 10.10.80.1 255.255.255.240
Answer: D Explanation:
255.255.224 equal /19 in CIDR format hence the answer
Question No: 127 – (Topic 3)
Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two)
It is locally significant.
It is globally significant.
It is needed to identify a unique instance of an OSPF database.
It is an optional parameter required only if multiple OSPF processes are running on the router.
All routers in the same OSPF area must have the same process ID if they are to
exchange routing information.
Answer: A,C Explanation:
They are locally significant only, and have no bearing on the structure of any OSPF packet or LSA update. So you can have a separate process-id on every single router in your network if you so desire.
Question No: 128 – (Topic 3)
What OSPF command, when configured, will include all interfaces into area 0?
A. network 0.0.0.0 255.255.255.255 area 0
B. network 0.0.0.0 0.0.0.0 area 0
C. network 255.255.255.255 0.0.0.0 area 0
D. network all-interfaces area 0
Answer: A Explanation:
Example 3-1 displays OSPF with a process ID of 1 and places all interfaces configured with an IP address in area 0. The network command network 0.0.0.0 255.255.255.255 area 0 dictates that you do not care (255.255.255.255) what the IP address is, but if an IP
address is enabled on any interface, place it in area 0.
Example 3-1 Configuring OSPF in a Single Area
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
Question No: 129 – (Topic 3)
The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic. There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at the default and the router IDs are shown with each router.
Which routers are likely to have been elected as DR? (Choose two.)
Answer: D,F Explanation:
There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs.
To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:
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’s physical interfaces will be chosen.
In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40)
amp; Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.
Question No: 130 – (Topic 3)
How many bits are contained in each field of an IPv6 address?
Answer: D Explanation:
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
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