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Question No: 1
Which switch would STP choose to become the root bridge in the selection process?
A. 32768: 11-22-33-44-55-66
B. 32768: 22-33-44-55-66-77
C. 32769: 11-22-33-44-55-65
D. 32769: 22-33-44-55-66-78
Answer: A
Explanation:
The root bridge of the spanning tree is the bridge with the smallest (lowest) bridge ID. Each bridge has a configurable priority number and a MAC Address; the bridge ID contains both numbers combined together - Bridge priority + MAC (32768.0200.0000.1111). The Bridge priority default is 32768 and can only be configured in multiples of 4096(Spanning tree uses the 12 bits extended system ID). To compare two bridge IDs, the priority is compared first, as if looking at a real number anything less than 32768...will become the target of being the root. If two bridges have equal priority then the MAC addresses are compared; for example, if switches A (MAC=0200.0000.1111) and B (MAC=0200.0000.2222) both have a priority of 32768 then switch A will be selected as the root bridge.
In this case, 32768: 11-22-33-44-55-66 would be the bridge because it has a lower priority and MAC address.
Question No: 2
The network administrator has been asked to give reasons for moving from IPv4 to IPv6. What are two valid reasons for adopting IPv6 over IPv4? (Choose two.)
A. no broadcast
B. change of source address in the IPv6 header
C. change of destination address in the IPv6 header
D. Telnet access does not require a password
E. autoconfiguration
F. NAT
Answer: A,E
Explanation:
IPv6 does not use broadcasts, and autoconfiguration is a feature of IPV6 that allows for hosts to automatically obtain an IPv6 address.
Question No: 3
Refer to the exhibit.
If the router Cisco returns the given output and has not had its router ID set manually, what value will OSPF use as its router ID?
A. 192.168.1.1
B. 172.16.1.1
C. 1.1.1.1
D. 2.2.2.2
Answer: D
Explanation:
If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface (loopback interface) or the highest IP address of an active interface. If more than one loopback interfaces are configured, the router will compare the IP addresses of each of the interfaces and choose the highest IP address from the loopbacks.
Question No: 4
What is the effect of using the service password-encryption command?
A. Only the enable password will be encrypted.
B. Only the enable secret password will be encrypted.
C. Only passwords configured after the command has been entered will be encrypted.
D. It will encrypt the secret password and remove the enable secret password from the configuration.
E. It will encrypt all current and future passwords.
Answer: E
Explanation:
Enable vty, console, AUX passwords are configured on the Cisco device. Use the show run command to show most passwords in clear text. If the service password-encryption is used, all the passwords are encrypted. As a result, the security of device access is improved.
Question No: 5
Refer to the exhibit.
Which WAN protocol is being used?
A. ATM
B. HDLC
C. Frame Relay
D. PPP
Answer: C
Explanation:
This question is to examine the show int command.
According to the information provided in the exhibit, we can know that the data link protocol used in this network is the Frame Relay protocol.
u201cLMI enq sentu2026u201d
Question No: 6
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).
Question No: 7
Which port state is introduced by Rapid-PVST?
A. learning
B. listening
C. discarding
D. forwarding
Answer: C
Explanation:
PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+.
Question No: 8
What are two benefits of using a single OSPF area network design? (Choose two.)
A. It is less CPU intensive for routers in the single area.
B. It reduces the types of LSAs that are generated.
C. It removes the need for virtual links.
D. It increases LSA response times.
E. It reduces the number of required OSPF neighbor adjacencies.
Answer: B,C
Explanation:
OSPF uses a LSDB (link state database) and fills this with LSAs (link state advertisement). The link types are as follows:
u2022LSA Type 1: Router LSA
u2022LSA Type 2: Network LSA
u2022LSA Type 3: Summary LSA
u2022LSA Type 4: Summary ASBR LSA
u2022LSA Type 5: Autonomous system external LSA
u2022LSA Type 6: Multicast OSPF LSA
u2022LSA Type 7: Not-so-stubby area LSA
u2022LSA Type 8: External attribute LSA for BGP
If all routers are in the same area, then many of these LSA types (Summary ASBR LSA, external LSA, etc) will not be used and will not be generated by any router.
All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0). In some cases, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non- backbone area. The area through which you configure the virtual link, known as a transit
area, must have full routing information. The transit area cannot be a stub area. Virtual links are not ideal and should really only be used for temporary network solutions or migrations. However, if all locations are in a single OSPF area this is not needed.
Question No: 9
What are two enhancements that OSPFv3 supports over OSPFv2? (Choose two.)
A. It requires the use of ARP.
B. It can support multiple IPv6 subnets on a single link.
C. It supports up to 2 instances of OSPFv3 over a common link.
D. It routes over links rather than over networks.
Answer: B,D
Explanation:
Here is a list of the differences between OSPFv2 and OSPFv3:
u2711 They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols
u2711 OSPFv3 introduces new LSA types
u2711 OSPFv3 has different packet format
u2711 OSPFv3 uses different flooding scope bits (U/S2/S1)
u2711 OSPFv3 adjacencies are formed over link-local IPv6 communications
u2711 OSPFv3 runs per-link rather than per-subnet
u2711 OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses
u2711 OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs)
u2711 OSPFv3 Neighbor Authentication done with IPsec (AH)
u2711 OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number
Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html
Question No: 10
Which two statements about the OSPF Router ID are true? (Choose two.)
A. It identifies the source of a Type 1 LSA.
B. It should be the same on all routers in an OSPF routing instance.
C. By default, the lowest IP address on the router becomes the OSPF Router ID.
D. The router automatically chooses the IP address of a loopback as the OSPF Router ID.
E. It is created using the MAC Address of the loopback interface.
Answer: A,D
Explanation:
r120#show ip ospf data
OSPF Router with ID (10.0.0.120) (Process ID 1) Next, who are the other routers in our area? Router Link States (Area 1)
Link IDADV RouterAgeSeq#ChecksumLink count 10.0.0.11110.0.0.1116000x8000023A0x0092B31
10.0.0.11210.0.0.11212460x800002340x009CAC1
10.0.0.11310.0.0.1131480x8000022C0x0043993
10.0.0.12010.0.0.1201520x800002400x0046CB1
We can see OSPF Router ID will be used as source of Type 1 LSA. Also the router will chose the highest loopback interface as its OSPF router ID (if available).