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NEW QUESTION: 1
HOTSPOT
A system administrator must upgrade the volume group vglogs to version 2.2 and verify that the change is applied correctly. Currently no logical volumes mounted from that volume group. Given this information, put the steps needed to accomplish this task in order.
Hot Area:
Answer:
Explanation:
NEW QUESTION: 2
Which statement about implementing the Cisco IPv6 provider Edge Router over MPLS is true?
A. 6PE feature is supported over tunnels other than RSVP-TE tunnels.
B. Core MPLS routers are supporting IPv6 only.
C. 6PE feature is not supported over tunnels other than RSVP-TE tunnels.
D. Core MPLS routers are supporting IPv4 only.
Answer: C
Explanation:
ReferencE. http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6over_mpls.pdf The following restrictions apply when implementing the IPv6 Provider Edge Router over MPLS (6PE) feature: Core MPLS routers are supporting MPLS and IPv4 only, so they cannot forward or create any IPv6 Internet Control Message Protocol (ICMP) messages. Load balancing ability is not provided by Cisco 6PE between an MPLS path and an IPv6 path. If both are available, the MPLS path is always preferred. Load balancing between two MPLS paths is possible. BGP multipath is not supported for Cisco 6PE routes. If two BGP peers advertise the same prefix with an equal cost, Cisco 6PE will use the last route to cross the MPLS core. 6PE feature is not supported over tunnels other than RSVP-TE tunnels.
NEW QUESTION: 3
What is a reason for 6PE to use two MPLS labels in the data plane instead of one?
A. 6PE allows penultimate hop popping and has a requirement that all P routers do not have to be IPv6 aware.
B. 6PE does not allow penultimate hop popping.
C. It allows MPLS traffic engineering to work in a 6PE network.
D. It allows 6PE to work in an MPLS network where 6VPE is also deployed.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Q. Why does 6PE use two MPLS labels in the data plane?
A. 6PE uses two labels:
When the 6PE was released, a main requirement was that none of the MPLS core routers (the P routers) had to be IPv6-aware. That requirement drove the need for two labels in the data plane.
There are two reasons why the 6PE needs both labels.
PHP Functionality
If only the transport label were used, and if penultimate hop popping (PHP) were used, the penultimate hop router (the P router) would need to understand IPv6. With PHP, this penultimate hop router would need to remove the MPLS label and forward the packet as an IPv6 packet. This P router would need to know that the packet is IPv6 because the P router would need to use the correct Layer 2 encapsulation type for IPv6.
(The encapsulation type is different for IPv6 and IPv4; for example, for Ethernet, the encapsulation type is
0x86DD for IPv6, while it is 0x0800 for IPv4.) If the penultimate hop router is not IPv6-capable, it would likely put the Layer 2 encapsulation type for IPv4 for the IPv6 packet. The egress PE router would then believe that the packet was IPv4.
There is time-to-live (TTL) processing in both the IPv4 and IPv6 headers. In IPv6, the field is called Hop Limit. The IPv4 and IPv6 fields are at different locations in the headers. Also, the Header Checksum in the IPv4 header would also need to be changed; there is no Header Checksum field in IPv6. If the penultimate hop router is not IPv6-capable, it would cause the IPv6 packet to be malformed since the router expects to find the TTL field and Header Checksum field in the header. Because of these differences, the penultimate hop router would need to know it is an IPv6 packet. How would this router know that the packet is an IPv6 packet, since it did not assign a label to the IPv6 Forwarding Equivalence Class (FEC), and there is no encapsulation field in the MPLS header? It could scan for the first nibble after the label stack and determine that the packet is IPv6 if the value is 6. However, that implies that the penultimate hop router needs to be IPv6-capable. This scenario could work if the explicit null label is used (hence no PHP).
However, the decision was to require PHP.
Load Balancing
Typical load balancing on a P router follows this process. The P router goes to the end of the label stack and determines if it is an IPv4 packet by looking at the first nibble after the label stack. In the 6PE scenario, imagine there are two egress PE routers advertising one IPv6 prefix in BGP towards the ingress PE router.
This IPv6 prefix would be advertised with two different labels in BGP. Hence, in the data plane, the bottom label would be either of the two labels. This would allow a P router to load balance on the bottom label on a per-flow basis. If 6PE used only the transport label to transport the 6PE packets through the MPLS core, the P routers would not be able to load balance these packets on a per-flow basis unless the P routers were IPv6-capable. If the P routers were IPv6-capable, they could use the source and destination IPv6 addresses in order to make a load balancing decision.
Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116061-qa-
6pe-00.html
NEW QUESTION: 4
What are two prerequisites for configuring a pair of Palo Alto Networks firewalls in an active/passive High Availability (HA) pair? (Choose two.)
A. The firewalls must have the same set of licenses.
B. HA1 should be connected to HA1, either directly or with an intermediate Layer 2 device.
C. The management interfaces must be on the same network.
D. The peer HA1 IP address must be the same on both firewalls.
Answer: A,D
Explanation:
Explanation/Reference:
To set up high availability on your Palo Alto Networks firewalls, you need a pair of firewalls that meet the following requirements:
The same set of licenses -Licenses are unique to each firewall and cannot be shared between the
firewalls. Therefore, you must license both firewalls identically. If both firewalls do not have an identical set of licenses, they cannot synchronize configuration information and maintain parity for a seamless failover.
The same type of interfaces -Dedicated HA links, or a combination of the management port and in-
band ports that are set to interface type HA.
Determine the IP address for the HA1 (control) connection between the HA peers. The HA1 IP address
for both peers must be on the same subnet if they are directly connected or are connected to the same switch.
Etc.
References: https://www.paloaltonetworks.com/documentation/70/pan-os/pan-os/high-availability/ prerequisites-for-active-passive-ha#_74574