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    CCIE R&S 350-001 Q&As – Implement IPv4 Border Gateway Protocol (BGP) (11-15)

    By admin | June 18, 2014

    Tagged with:

    Section 6 – Implement IPv4 Border Gateway Protocol (BGP)

    QUESTION 11
    You work as a network engineer for the company, you want to configure two BGP speakers to form an EBGP session across a firewall. On the engineer’s network, the firewall always permits TCP sessions that are initiated from the inside network (the network attached to the inside interface of the firewall). What prerequisite is there for enabling BGP to run on this network?
    A.    EBGP multihop will need to be configured for this to work.
    B.    This should work with normal BGP peering, with no additional configuration on the BGP speakers or the firewall.
    C.    The BGP protocol port must be opened on the firewall
    D.    There is no way to make BGP work across a firewall.
    Answer: A

    Explanation:
    Lead2Pass says C but question states firewall permits sessions from inside and  I would have to assume that they mean allowing the destination port of 179 but it does not have to be done both inbound and outbound.
    If port is open eBGP multihop must also be enabled
    I choice answer A

    QUESTION 12
    QPPB is an acronym for QoS Policy Propogation via BGP.  QPPB allows which of these marking behaviors?
    A.    The assigning of only a BGP specific community attribute based on the ingress packet DSCP marking.
    B.    The assigning of only a BGP specific attribute based on the IP precedence and DSCP of ingress packet.
    C.    QPPB provides no marking or classification behaviors.
    D.    The use of NBAR to associate an IP Precedence to a packet.
    Answer: B
    Explanation:
    The Quality of Service (QoS) policy propagation via Border Gateway Protocol (BGP) feature allows you to classify packets based on access lists, BGP community lists, and BGP autonomous system (AS) paths. The supported classification policies include Internet Protocol (IP) precedence setting and the ability to tag the packet with a QoS class identifier internal to the router. After a packet has been classified, you can use other QoS features such as Committed Access Rate (CAR) and Weighted Random Early Detection (WRED) to specify and enforce business policies to fit your business model.
    The QoS policy propagation via BGP feature was introduced in Cisco IOS Release 11.1(17)CC. With Release 11.1(20)CC, the QoS policy propagation via BGP feature has the following enhancements:
    ?QoS group ID—You can set an internal QoS group ID that can be used later to perform rate-limiting or weighted fair queuing based on the Qos group ID. In the previous release you could only set up to eight IP precedence level to classify packets. By setting the QoS group ID in addition to the IP precedence, you can now have more than eight classes on which to perform rate-limiting or weighted fair queuing.
    ?Source and destination address lookup—You can specify whether the IP precedence level or QoS group ID used is obtained from the source (input) address or destination (output) address entry in the route table. In the previous release you could only use the destination address. You can now specifying the input or output address.
    Benefits
    BGP policy propagation provides the following benefits:
    ?Allows you to classify packets using access lists, community lists, and AS paths.
    ?Leverages BGP to distribute QoS policy to remote routers in your network.
    ?Allows ingress routers to prioritize incoming and outgoing traffic.
    ?Allows you to classify packets based on IP precedence or QoS group ID.
    List of Terms
    Autonomous system (AS) path—A collection of networks under a common administration sharing a common routing strategy. BGP carries the AS path in its routing updates. You can filter routing updates by specifying an access list on both incoming and outbound updates based on the BGP AS path.
    Border Gateway Protocol (BGP)—Interdomain routing protocol that replaces EGP. BGP exchanges reachability information with other BGP systems. It is defined by RFC 1163.
    Cisco Express Forwarding (CEF)—CEF is an advanced Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive Web-based applications, or interactive sessions. Although you can use CEF in any part of a network, it is designed for high-performance, highly resilient Layer 3 IP backbone switching.
    Committed Access Rate (CAR)—CAR limits the input or output transmission rate on an interface or subinterface based on a flexible set of criteria. In addition, CAR classifies packets by setting the IP precedence. CAR can be used to rate-limit traffic based on packet characteristics such access list, incoming interface, or IP precedence. CAR provides configurable actions, such as transmit, drop, or set precedence, when traffic conforms to or exceeds the rate limit.
    Community list—A community is a group of destinations that share some common attribute. You use community lists to create groups of communities to use in a match clause of a route map. Just like an access list, a series of community lists can be created.
    Internet Protocol (IP) precedence—Bits within the ToS (type of service) field of the IP header that can be used to classify packets.
    QoS group ID—User-specified number that is assigned to a packet when that packet matches user-specified criteria. The packet can then be classified based on that number.
    Weighted Random Early Detection (WRED)—Drops packets selectively based on IP precedence. Packets with a higher IP precedence are less likely to be dropped than packets with a lower precedence. Thus, higher priority traffic is delivered with a higher probability than lower priority traffic. WRED is useful on any output interface where you expect to have congestion. However, WRED is usually used in the core routers of a network, rather than the edge. Edge routers assign IP precedences to packets as they enter the network. WRED uses these precedences to determine how it treats different types of traffic

    QUESTION 13
    Lookat the following network carefully.  The technician has configured all routers to advertise all connected links through BGP, and R2 through R4 to advertize all connected links via OSPF.  At R4, 172.30.1.0/24 is not in the local BGP table or the local routing table.  Why?

    clip_image001
    A.    R3 is learning 172.30.1.0/24 through iBGP, and therefore it will not re-advertize this route to its BGP peers, including R4.
    B.    R3 is probably filtering 172.30.1.0/24, without examining the configuration on R2, you are unable to fix the problem.
    C.    R4 has no path  to the next hop for 172.30.1.0/24, R1.
    D.    At R4, the next-hop for 172.30.1.0/24 is R1, and R1 is learning about the network between R1 and R2 through IBGP. BGP does not allow a route with an IBGP next hop to be installed in the local routing table.
    Answer: A
    Explanation:
    When an AS provides transit service to other ASs and if there are non-BGP routers in the AS, transit traffic might be dropped if the intermediate non-BGP routers have not learned routes for that traffic via an IGP. The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP.

    QUESTION 14
    Study the exhibit carefully, R2 has no routes for 10.100.X.X routes in its BGP or routing table. Why not?

    clip_image002
    A.    BGP will not advertize a route unless it is syncrhonized with the IGP.
    B.    BGP will not advertize a route that is not in the routing table.
    C.    The serial link between the routers is not participating in the BGP process.
    D.    The advertized BGP next hop is not in R2′s routing table.
    Answer: B

    QUESTION 15
    Refer to the exhibit. Packets from hosts attached to R3 and destined for network 10.100.2.0 are being sent to R4 via R1. Which of these is a solution to the problem?

    clip_image003
    A: Set the update source on R3 to R5.
    B: Set the next-hop-self command on R2 for neighbor R3.
    C: Enable EBGP multihop between R2 and R3.
    D: Set R3 to advertise its specific 24 bit 10.x.x.x routes to R1.
    E: Increase the weight parameter for the 10.100.0.0 route on R3.
    Correct Answers:  B
    Explanation:
    In eBGP peering, the next hop is the IP address of the neighbor that announces the route. However, when the route is advertised on a multi-access media (such as Ethernet or Frame Relay), the next hop is usually the IP address of the router interface connected to that media, which originated the route.
    iBGP sessions preserve the next hop attribute learned from eBGP peers. This is why it is important to have an internal route to the next hop. The BGP route is otherwise unreachable. In order to make sure you can reach the eBGP next hop, include the network that the next hop belongs to in the IGP or issue the next-hop-self neighbor command to force the router to advertise itself, rather than the external peer, as the next hop.

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