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CCIE Theory IPv4
CCIE Theory Impliment IPv4
| Question | Answer |
|---|---|
| You use OSPF as your routing protocol. You use the command show IP route and you see several routes described as O,OIA,OE1, OE2. What routes are in your area? | O |
| Which of these statements best describes how neighbor adjacencies are formed in a multi-access OSPF network? | The router with the highest priority will become the DR |
| A user with IP 10.10.10.200 fails to telnet to a switch with IP address 10.10.20.2. What is the cause of the issue? | IP routing is enabled on the switch , but no route pointing back to the client is configured |
| By default, EIGRP will use which percentage of the bandwidth on an interface? | 50 % |
| If the Local OSPF route goes away, the BGP route needs to be used. What should be configured to make sure the router will choose the LAN network as the preferred path? | bgp backdoor command. |
| Which two orders in the BGP best path selection process are correct? | 1 Higher local preference, lowest MED. then eBGP over iBGP paths 2 Highest weight, then higher local preference, then lowest router ID |
| When a router makes a forwarding decision, which of these routes in the routing table always wins? | longest prefix match |
| Command: Show ip ospf statistics What triggered the first SPF recalculation? | Changes is a router LSA, Summary network LSA, and external LSA |
| Command: show ip bgp By default, why will BGP choose a local originated route over any iBGP or eBGP learned route? | Locally originated routes have a weight of 32768 |
| Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the provider? | Bidirectional Forwarding Detection |
| Which four are possible states in the BGP FSM? | 1 Idle 2 Established 3 Active 4 OpenSent |
| What action will a BGP route reflector take when it receives a prefix marked with the community attribute NO ADVERTISE from a client peer? | it will not advertise the prefix to any peers |
| The next hops are learned via OSPF and IS-IS. Which path is selected as the best path for 10.168.0.1? | the path via 10.0.0.3 because it has the lowest IGP metric |
| The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in multivendor networks. When using OSPF Graceful Restart, which mechanism is used to continue forwarding packets during switchover? | Hardware-based forwarding |
| Which OSPF LSA type does an ASBR use to originate a default route into an area? | LSA 5 |
| Which two EIGRP options will limit a query domain? | 1 configuring EIGRP stubs 2 Configuring summary addresses |
| What statement is correct about an OSPF sham-link? | A sham-link is a logical link between PE routers that provides an OSPF adjacency between the PE routers and carries OSPF LSAs |
| Which one of these statements is true of OSPF type 5 LSAs? | They are flooded to all areas except stub areas (external route) |
| R4 is a remote office router that is running EIGRP, the decision has been made to change EIGRP to use static EIGRP adjacencies. However, once the configuration change was applied, the adjacency between R4 and 209.165.202.139(HQ) seems to disappear. Cause? | Static EIGRP neighbor configuration is symmetric, it causes the interface to stop processing inbound multicast packets and stop sending multicast packets |
| Which two options does Cisco PIR use to control the entrance link selection with inbound optimization? | 1 Prepend extra AS hops to the BGP prefix 2 Add(prepend) one or more communities to the prefix that is advertised by BGP |
| Which type of prefixes will a router running BGP most likely advertise to an IBGP peer, assuming it is not configured as a route reflector? | prefixes received fro EIGRP peers and prefixes locally originated via network statements or redistributed |
| Which reserved 2-byte AS number is seen in the AS path when BGP router is not capable of understanding 4-bytw AS numbers? | 23456 |
| Your cisco network currently runs OSPF and you have a need to policy-route some specific traffic, regardless of what the routing table shows. Which one of these options would enable you to policy-route the traffic? | source IP address and the protocol(such as SSL.HTTPS,SSH) |
| You have two EBGP peers connected via two parallel serial lines. What should you do to be able to load-balance between two EBGP speakers over the parallel serial lines in both directions? | Configure a loopback as update source for both EBGP peers and have on each AS an IGP to introduce two equal-cost paths to reach the peer loopback address, it is also necessary to use the ebgp-multihop and next-hop-self commands |
| When a BGP router is not capable of understanding 4-byte AS numbers, it will see 4-byte AS numbers as a special, reserved, 2-byte AS number in the AS path. Which 2-byte AS number is this reserved one? | 23456 |
| Which statement best describes OSPF external LSA,(type 5)? | External network LSAs(type5) redistributed from other routing protocols into OSPF are not permitted to flood into a stub area |
| In BGP routing , what does the rule of synchronization mean? | A BGP router can only advertise an IBGP learned route, provided that the route is an IGP route in the routing table |
| A backup is deployed at a remote site. Stability has been a concern.To provide more info to EIGRP regarding the interface you wish to incorporate the "reliability" cost metric in the EIGRP cal with weights 10101. What impact EIGRP neighborships? | All existing neighbor relationships will go down. |
| BGP table (65333) Why is AS 65333 in parentheses? | It is a confederation A.S. |
| Area Border Router (ABR) is a router located in the border of one or more OSPF areas that connect those areas to the backbone network. An ABR will inject a default route into which two tyoes of area? | 1 Totally stubby 2 Stub |
| Two routers configured to run BGP have been connected to a firewall. What is a good first test to see if BGP will work across the firewall? | There is no way to make BGP work across a firewall without special configuration, so there is no simple test that will show you if BGP will work or not , other than trying to start the peering session. |
| Which individual metrics can be used to calculate the composite EIGRP metric? | Total delay, minimum bandwidth, reliability, load |
| Two directly connected routers, R1 and R2, are both configured for OSPF graceful restart R2 is able to switch packets in hardware, but R1 is not. If a network administrator logs on to R2 and performs a system reload, which will be the result? | Traffic forwarded from R2 to or through R1 will continue to be forwarded based on the forwarding table state at the time of the reload. |
| Policy-based routing allows network administrators to implement routing polices to allow or deny paths based on all of these factors except which one? | Throughput |
| R1 has an EBGP session to ISP 1 and an EBGP session to ISP 2. R1 receives the same prefixes through both links. Which configuration should be applied so that the link between R1 and ISP 2 will be preferred for outgoing traffic (R1 to ISP2)? | Increase local preference on R1 for routes received from ISP 2 |
| You work as a network engineer for the company, you want t configure two BGP speakers to form an EBGP session across a firewall. What prerequisite is there for enabling BGP to run in this Network? | The BGP protocol port must be opened on the firewall |
| Router 1 is configured for BGP as dual-homed on the Cisco network. Which three BGP attributes are carried in every BGP update on this router (both IBGP and EBGP)? | 1 Origin 2 AS-path 3 Next-Hop |
| exhibit: Rout-map direct-traffic permit 10 match ip address 100 set next-hop 100 access-list 100 permit ip any host 10.1.14.25 access-list 100 permit ip 10.2.0.0 0.0.255.255 any What will be the objective of this route map when applied to a router? | take any packet sourced from any address in the 10.2.0.0/16 network or destined to 10.1.14.25 and set the next hop to 10.1.1.1 |
| What information will the Cisco IOS command Show ip OSPF RIB display? | all the OSPF routes from the OSPF database that are eligible to be put in the routing table. |
| R4 is configured as an OSPF stub; however, R4 should still be learning the OSPF LSA type 3 inter area routes from 209.165.202.130 Which action will solve this issue? | Enable sending Summary LSA's by removing no-summary from the stub command on the ABR |
| show ip OSPF border-routers OSPF process 100 internal routing table codes: i - intra-area route I - inter - area route 1 11.200.1.1 [128] via 11.1.4.4 serial2/0 ABR/ASBR, area 0 spf 14 i 11.100.1.2 [128] via 11.1.5.10 serial3/0 ABR/ASBR area 0 spf 14 | The OSPf cost to both border routers is 128 |
| based on the network provided in the exhibit, in these two areas, all routers are performing OSPF on all interfaces. After examining the OSPF database on R4, do you know which type of LSA will contain 10.1.5.0/24 and which router will have originated it? | 10.1.5.0/24 will be in a summary (type 3)LSA originated by R3 |
| In your Cisco EIGRP network, you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur? | 1 An update packet with init flag set from a know, already established neighbor relationship was received by one of the routes 2 The IP EIGRP neighbor relationship was cleared manually |
| Which three factors have the biggest influence on OSPF scalability? | 1 Flooding paths and redundancy 2 Amount of routing information in the OSPF area or routing domain. 3 Number of neighbor adjacencies |
| The network is used to carry voice traffic and other applications. Convergence time is taking more than expected. Which three actions would you take to improve OSPF convergence time? | 1 Change the network type to point-to-point on those links. 2 Reduce SPF initial timer 3 Increase hello interval to avoid adjacency flapping |
| which description of the following is true according to the information shown in the figure? Hostname RTB router eigrp 10 network 192.168.10.0 network 172.16.0.0 distribute-list 10 out s0/0 access-list 10 permit 192.168.10.0 0.0.0.255 | RTC will not have the 10.0.0.0 network in its routing table |
| In the network, R1 is redistributing 10.1.5.0/24 into OSPF, and R2 is originating 10.1.4.0/24 as an internal route. R6 has received packets destined to 10 .1.4.1 and 10.1.5.1. Which statement is true about the path these two packets will take? | The packet destined to 10.1.5.1 will follow the optimum path through the network. R4 to R1, while the packet destined to 10.1.4.1 will follow a suboptimal path through the network |
| Based on the output provided in the exhibit to which address or location will the router forward a packet sent to 192.168.32.1 D 192.168.32.0/26 [90/25789217] via 10.1.1.1 R 192.168.32.0/24 [120/4] via 10.1.1.2 O 192.168.32.0/19 110/229840 via 10.1.1.3 | 10.1.1.1 |
| R1 has an EBGP session to ISP 1 and an EBGP session to ISP 2. R1 receives the same prefixes through both links. Which configuration should be applied so that the link between R1 and ISP 2 will be preferred for outgoing traffic(R1 to ISP 2)? | Increase-local preference on R1 for received routes |
| The purpose of the route map when applied to traffic passing router route-map direct-traffic permit 10 match ip address 100 set next-hop 10.1.1.1 access-list 100 permit ip any host 10.1.14.25 access-list 100 permit ip 10.2.0.0 0.0.255.255 any | take any packet sourced form any address in the 10.2.0.0/16 network or destined to 10.1.14.25 and set the next hop to 10.1.1.1 |
| Which three options are valid ways to filter routes from a BGP peer? | 1 Filter-list 2 route-map 3 Prefix-list |
| What are the mandatory, well-known BGP attributes? | Origin, AS-path, Next-hop |
| R4 is configured as a receive-only EIGRP stub, and is adjacent with 209.165.202.139(R3). However, R4 is not learning about network 209.165.201.0/27 from R3. What could be the cause of this issue? | R3 is configured as a receive-only EIGRP stub. |
| How would you get the 1.1.1.1 network into the OSPF database? | Set up a virtual link between area 1 and area 0 |
| Which two steps below should you perform on the hub router while configuring EIGRP routing over DMVPN(mGRE tunnel)? | 1 add the disable EIGRP as-member split-horizon command 2 add the disable EIGRP as-member next-hop-self command |
| Which of these best identifies the types of prefixes a router running BGP will advertise to an EBGP peer? | prefixes received from any other BGP peer nad prefixes locally originated via network statements or redistributed to BGP |
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