[2021-New] Cisco 200-125 Dumps With Update Exam Questions (71-80)

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Q1. - (Topic 5)

How does a DHCP server dynamically assign IP addresses to hosts?

A. Addresses are permanently assigned so that the host uses the same address at all times.

B. Addresses are assigned for a fixed period of time. At the end of the period, a new request for an address must be made, and another address is then assigned.

C. Addresses are leased to hosts. A host will usually keep the same address by periodically contacting the DHCP server to renew the lease.

D. Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

Answer: C

Explanation:

DHCP works in a client/server mode and operates like any other client/server relationship. When a PC connects to a DHCP server, the server assigns or leases an IP address to that PC. The PC connects to the network with that leased IP address until the lease expires. The host must contact the DHCP server periodically to extend the lease. This lease mechanism ensures that hosts that move or power off do not hold onto addresses that they do not need. The DHCP server returns these addresses to the address pool and reallocates them as necessary.

Q2. - (Topic 3)

Refer to the graphic.

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)

A. All of the routers need to be configured for backbone Area 1.

B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.

C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.

D. The hello and dead interval timers are not set to the same values on R1 and R3.

E. EIGRP is also configured on these routers with a lower administrative distance.

F. R1 and R3 are configured in different areas.

Answer: D,F

Explanation:

This question is to examine the conditions for OSPF to create neighborhood.

So as to make the two routers become neighbors, each router must be matched with the following items:

1. The area ID and its types;

2. Hello and failure time interval timer;

3. OSPF Password (Optional).

Q3. - (Topic 5)

What are three features of the IPv6 protocol? (Choose three.)

A. optional IPsec

B. autoconfiguration

C. no broadcasts

D. complicated header

E. plug-and-play

F. checksums

Answer: B,C,E

Explanation:

An important feature of IPv6 is that it allows plug and play option to the network devices by allowing them to configure themselves independently. It is possible to plug a node into an IPv6 network without requiring any human intervention. This feature was critical to allow network connectivity to an increasing number of mobile devices. This is accomplished by autoconfiguration.

IPv6 does not implement traditional IP broadcast, i.e. the transmission of a packet to all hosts on the attached link using a special broadcast address, and therefore does not define broadcast addresses. In IPv6, the same result can be achieved by sending a packet to the link-local all nodes multicast group at address ff02::1, which is analogous to IPv4 multicast to address 224.0.0.1.

Q4. - (Topic 8)

Which two statements about unique local IPv6 addresses are true?

A. They are identical to IPv4 private addresses.

B. They are defined by RFC 1884.

C. They use the prefix FEC0::/10

D. They use the prefix FC00::/7

E. They can be routed on the IPv6 global internet.

Answer: A,D

Q5. - (Topic 3)

If IP routing is enabled, which two commands set the gateway of last resort to the default gateway? (Choose two.)

A. ip default-gateway 0.0.0.0

B. ip route 172.16.2.1 0.0.0.0 0.0.0.0

C. ip default-network 0.0.0.0

D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1

E. ip route 0.0.0.0 0.0.0.0 172.16.2.1

Answer: C,E

Explanation:

Both the “ip default-network” and “ip route 0.0.0.0 0.0.0.0 (next hop)” commands can be used to set the default gateway in a Cisco router.

Q6. - (Topic 8)

Which three circumstances can cause a GRE tunnel to be in an up/down state? (Choose three.)

A. The tunnel interface IP address is misconfigured.

B. The tunnel interface is down.

C. A valid route to the destination address is missing from the routing table.

D. The tunnel address is routed through the tunnel itself.

E. The ISP is blocking the traffic.

F. An ACL is blocking the outbound traffic.

Answer: B,C,D

Q7. - (Topic 5)

Refer to the exhibit.

A new subnet with 60 hosts has been added to the network. Which subnet address should this network use to provide enough usable addresses while wasting the fewest addresses?

A. 192.168.1.56/26

B. 192.168.1.56/27

C. 192.168.1.64/26

D. 192.168.1.64/27

Answer: C

Explanation:

A subnet with 60 host is 2*2*2*2*2*2 = 64 -2 == 62

6 bits needed for hosts part. Therefore subnet bits are 2 bits (8-6) in fourth octet. 8bits+ 8bits+ 8bits + 2bits = /26

/26 bits subnet is 24bits + 11000000 = 24bits + 192 256 – 192 = 64

0 -63

64 – 127

Q8. - (Topic 5)

What are three approaches that are used when migrating from an IPv4 addressing scheme to an IPv6 scheme. (Choose three.)

A. enable dual-stack routing

B. configure IPv6 directly

C. configure IPv4 tunnels between IPv6 islands

D. use proxying and translation to translate IPv6 packets into IPv4 packets

E. statically map IPv4 addresses to IPv6 addresses

F. use DHCPv6 to map IPv4 addresses to IPv6 addresses

Answer: A,C,D

Explanation:

Several methods are used terms of migration including tunneling, translators, and dual stack. Tunnels are used to carry one protocol inside another, while translators simply translate IPv6 packets into IPv4 packets. Dual stack uses a combination of both native IPv4 and IPv6. With dual stack, devices are able to run IPv4 and IPv6 together and if IPv6 communication is possible that is the preferred protocol. Hosts can simultaneously reach IPv4 and IPv6 content.

Q9. - (Topic 5)

A network engineer wants to allow a temporary entry for a remote user with a specific username and password so that the user can access the entire network over the Internet.

Which ACL can be used?

A. standard

B. extended

C. dynamic

D. reflexive

Answer: C

Explanation:

We can use a dynamic access list to authenticate a remote user with a specific username and password. The authentication process is done by the router or a central access server such as a TACACS+ or RADIUS server. The configuration of dynamic ACL can be read here: http://www.cisco.com/en/US/tech/tk583/tk822/technologies_tech_note09186a0080094524. shtml

Q10. - (Topic 3)

What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.)

A. hello packets

B. SAP messages sent by other routers

C. LSAs from other routers

D. beacons received on point-to-point links

E. routing tables received from other link-state routers

F. TTL packets from designated routers

Answer: A,C

Explanation:

Neighbor discovery is the first step in getting a link state environment up and running. In keeping with the friendly neighbor terminology, a Hello protocol is used for this step. The protocol will define a Hello packet format and a procedure for exchanging the packets and processing the information the packets contain.

After the adjacencies are established, the routers may begin sending out LSAs. As the term flooding implies, the advertisements are sent to every neighbor. In turn, each received LSA

is copied and forwarded to every neighbor except the one that sent the LSA.