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2021 Mar 400-101 test engine
Q321. Which three statements are true about VSS? (Choose three.)
A. VSS separates the control planes of the active and the standby chassis.
B. Configuration changes can be made on both active and standby chassis.
C. When the VSS active chassis recovers after a failure, it initiates a switchover and takes on the active role again.
D. VSS unifies the control planes of the active and the standby chassis.
E. HSRP configuration is not required to run VSS.
F. The VSS standby chassis monitors the VSS active chassis using the VSL.
Answer: D,E,F
Explanation:
VSS operates on a unified control plane with a distributed forwarding architecture in which the active supervisor (or switch) is responsible for actively participating with the rest of the network and for managing and maintaining control plane information. VSS actually removes the need for a next-hop redundancy protocol like HSRP or VRRP. These first-hop redundancy protocols are usually heavily tied to a fast-converging routing protocol like EIGRP, and still require that each device maintain its own control plane. The standby chassis monitors the active chassis using the VSL. If it detects failure, the standby chassis initiates a switchover and takes on the active role. When the failed chassis recovers, it takes on the standby role.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/virtual_switching_systems.pdf
Q322. Which map is locally defined?
A. DSCP-to-DSCP-mutation
B. CoS-to-DSCP
C. IP-precedence-to-DSCP
D. DSCP-to-CoS
Answer: A
Q323. Refer to the exhibit.
Your organization has two offices, Site 1 and Site 2, which are connected by a provider
backbone, as shown. Where must you configure an attachment circuit to allow the two sites to connect over a Layer 2 network using L2TPv3?
A. PE Site 1 Fa1/0 and PE Site 2 Fa0/0
B. CE Site 1 Fa0/0 and CE Site 2 Fa0/0
C. PE Site 1 Se0/0 and PE Site 2 Se0/0
D. CE Site 1 Fa0/0 and PE Site 2 Se0/0
Answer: A
Q324. Refer to the exhibit.
Which statement is true about why the first-hop PIM IPv6 router is stuck in registering?
A. The scope of the IPv6 multicast address is link-local.
B. The outgoing interface for the IPv6 multicast group should not be a tunnel interface.
C. The R-bit is set in the IPv6 address, but this is not an embedded RP multicast IPv6 address.
D. The S flag should not be set on a first-hop PIM router.
E. A multicast IPv6 address does not start with FF.
Answer: C
Explanation:
.R bit: RP bit: R = 1 indicates the address embeds the address of the Rendezvous Point (RP). The embedded RP address needs to begin with the prefix FF70::/12, But here we see that the address is FF7E::1234.
Q325. Which two hashing algorithms can be used when configuring SNMPv3? (Choose two.)
A. MD5
B. SHA-1
C. Blowfish
D. DES
E. AES
F. SSL
Answer: A,B
Explanation:
Note that SNMPv3 does not send passwords in clear-text and uses hash-based authentication with either MD5 or SHA1 functions (HMAC authentication – the packet conted is hashed along with authentication key to produce the authentication string).
Reference: http://blog.ine.com/2008/07/19/snmpv3-tutorial/
Most recent 400-101 test question:
Q326. Refer to the exhibit.
If a port is configured as shown and receives an untagged frame, of which VLAN will the untagged frame be a member?
A. VLAN 1
B. VLAN 2
C. VLAN 3
D. VLAN 4
Answer: B
Explanation:
When typing: Switch(config-if)#switchport mode?
access Set trunking mode to ACCESS unconditionally
dynamic Set trunking mode to dynamically negotiate access or trunk mode
trunk Set trunking mode to TRUNK unconditionally
and
Switch(config-if)#switchport mode dynamic?
auto Set trunking mode dynamic negotiation parameter to AUTO
desirable Set trunking mode dynamic negotiation parameter to DESIRABLE
So if we configure Fa0/1 as dynamic auto mode, it will not initiate any negotitation but waiting for the other end negotiate to be a trunk with DTP. If the other end does not ask it to become a trunk then it will become an access port. Therefore when using the “show interface fastEthernet0/1 switchport” command we will see two output lines “ Administrative Mode. dynamic auto” and “Operational Mode. static access” Note. To set this port to VLAN 2 as the output above just use one additional command. “switchport access vlan 2”.
Now back to our question, from the output we see that Fa0/1 is operating as an access port on VLAN 2 so if it receive untagged frame it will suppose that frame is coming from VLAN 2.
Q327. On a network using RIPng, the prefix field of a routing table entry has a value of 0:0:0:0:0:0:0:0. What does this value signify?
A. The next hop address is unknown.
B. The next hop address is a site-local address.
C. The neighboring router has IPv6 ND disabled.
D. The next hop address must be the originator of the route advertisement.
E. The associated route follows a default route out of the network.
Answer: E
Q328. Which statement about a type 4 LSA in OSPF is true?
A. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ASBR.
B. It is an LSA that is originated by an ASBR, that is flooded throughout the AS, and that describes a route to the ASBR.
C. It is an LSA that is originated by an ASBR, that is flooded throughout the area, and that describes a route to the ASBR.
D. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ABR.
E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR.
Answer: E
Explanation:
LSA Type 4 (called Summary ASBR LSA) is generated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to external routes through that ASBR.
Q329. DRAG DROP
Drag and drop the IPv6 address on the left to the correct IPv6 address type on the right.
Answer:
Q330. Which two statements about BPDU guard are true? (Choose two.)
A. The global configuration command spanning-tree portfast bpduguard default shuts down interfaces that are in the PortFast-operational state when a BPDU is received on that port.
B. The interface configuration command spanning-tree portfast bpduguard enable shuts down only interfaces with PortFast enabled when a BPDU is received.
C. BPDU guard can be used to prevent an access port from participating in the spanning tree in the service provider environment.
D. BPDU guard can be used to protect the root port.
E. BPDU guard can be used to prevent an invalid BPDU from propagating throughout the network.
Answer: A,C