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2021 Nov cisco 400-101:
Q451. Refer to the exhibit.
Which statement about the R1 configuration is true?
A. It permits host 10.1.1.2 to establish a Telnet connection to R1.
B. It limits remote hosts to two SSH connection attempts.
C. SSH connections to R1 will log out after a 5-minute idle interval.
D. Hosts that reside on network 10.0.0.0/8 can SSH to R1.
E. The R1 timeout for outgoing SSH connection attempts is 30 seconds.
Answer: E
Explanation:
The timeout for outgoing SSH connection is defined by the “ip sshh time-out” command (in seconds), which is configured here as 30.
Q452. What is the maximum number of classes that MQC can support in a single policy map?
A. 512
B. 256
C. 128
D. 64
Answer: B
Q453. Refer to the exhibit.
If OSPF is implemented on the network, which additional configuration is needed to allow traffic from host 10.4.1.15/24 to host 10.1.2.20/24?
A. A virtual link between router 2 and router 4
B. A virtual link between router 3 and router 4
C. A virtual link between router 2 and router 3
D. The current design allows traffic between the two hosts.
Answer: D
Explanation:
This specific traffic from 10.4.1.0/24 to 10.1.2.0/24 would work because this traffic crosses only over the single OSPF area of 0.0.0.1.
However, traffic from hosts on R4 to R1 would indeed need a virtual link, since area 0.0.0.2 is not connected to the backbone area of 0.0.0.0.
Q454. Refer to the exhibit.
All routers are running EIGRP and the network has converged. R3 and R4 are configured as EIGRP Stub. If the link between R1 and R3 goes down, which statement is true?
A. R1 sends traffic destined to 192.168.0.100 via R2.
B. R2 does not have a route to 192.168.0.0/24 in the routing table.
C. The prefix 192.168.0.0/24 becomes stuck-in-active on R4.
D. R3 does not advertise 192.168.0.0/24 to R4 anymore.
Answer: B
Q455. Which two statements about IPv4 and IPv6 networks are true? (Choose two.)
A. In IPv6, hosts perform fragmentation.
B. IPv6 uses a UDP checksum to verify packet integrity.
C. In IPv6, routers perform fragmentation.
D. In IPv4, fragmentation is performed by the source of the packet.
E. IPv4 uses an optional checksum at the transport layer.
F. IPv6 uses a required checksum at the network layer.
Answer: A,B
Up to the minute cisco 400-101:
Q456. Refer to the exhibit.
For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table?
A. The AS number of the BGP is specified in the given AS_PATH.
B. The origin of the given route is unknown.
C. BGP is designed only for publicly routed addresses.
D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed.
E. BGP does not allow the AS number 65535.
Answer: A
Explanation:
BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route.
Q457. DRAG DROP
Drag and drop the DSCP PHB on the left to the corresponding binary representation on the right.
Answer:
Q458. Which command do you use to connect a dense-mode domain to a sparse-mode multicast domain?
A. none, because there is no such command
B. ip pim spt-threshold infinity
C. ip pim register dense-mode
D. ip pim dense-mode proxy-register
Answer: D
Explanation:
For IP PIM multicast, Cisco recommends Sparse-Mode over Dense-Mode. In the midst of our network migration, we have a new network operating in Sparse-Mode with Anycast rendezvous point (RP) but our existing network is still operating in Dense-Mode. To bridge two different modes across both PIM domains, we should use the ip pim dense-mode proxy-register command on the interface leading toward the bordering dense mode region. This configuration will enable the border router to register traffic from the dense mode region (which has no concept of registration) with the RP in the sparse mode domain.
Reference: http://networkerslog.blogspot.com/2010/12/bridging-dense-mode-pim-to-sparse-mode.html
Q459. DRAG DROP
Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right.
Answer:
Q460. Which two statements about MLD are true? (Choose two.)
A. MLD is a subprotocol of ICMPv6.
B. When a single link supports multiple interfaces, only one interface is required to send MLD messages.
C. MLD is a subprotocol of PIMv6.
D. When a single link supports multiple interfaces, all supported interfaces are required to send MLD messages.
E. There are three subtypes of MLD query messages.
F. The code section in the MLD message is set to 1 by the sender and ignored by receivers.
Answer: A,B