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ICND2 Study
ICND2 Study Stack Flashcards
| Question | Answer |
|---|---|
| Distance Vector Protocols send what: | Send the entire table to directly connected routers. |
| Link State Protocols send what: | Details about their directly connected links to all other routers on the network. |
| Administrative Distace for connected route: | 0 |
| Administrative Distace for static route | 1 |
| Administrative Distace for EIGRP summary | 5 |
| Administrative Distace for external BGP | 20 |
| Administrative Distace for EIGRP | 90 |
| Administrative Distace for IGRP | 100 |
| Administrative Distace for OSPF | 110 |
| Administrative Distace for ISIS | 115 |
| Administrative Distace for RIP | 120 |
| Administrative Distace for External EIGRP | 170 |
| Administrative Distace for Internal BGP | 200 |
| Administrative Distace for unknown | 255 |
| Numbers in square brackets on routes are [ / ] | Distance / Metric |
| What does Frame Relay use to build tables of mappings from layer 3 addresses to PVC's | Inverse ARP (show frame-relay map) |
| What is a DLCI | Data Link Connection Identifier is a reference number between the logical DTE (router uasually) and works with the FrameRelay switch |
| When performing Frame-Relay troubleshooting - first step: | Put interface in HDLC encapsulation |
| BECN in Frame Relay = | Backward Explicit congestion Notification |
| FECN in Frame Relay = | Forward Explicit Congestion Notification |
| Frame Relay DE bit is what | A Discard Eligibility which tells the switch the frame is less important. |
| ppp authentication requires what of password | Same password on all routers |
| On frame relay point-to-multipoint has what issues when split horizon enabled - what fixes this issue | Split horizon breaks route summarization. Create sub-interfaces. |
| Point to Point serial links in IPV4 require what of addresses? | That they are in the same subnet |
| What does LMI stand for | Local Management Interface |
| DLC's need to be mapped to what type of IP addresses | Same subnet. Multiple ranges for multiple circuits. |
| On a serial DTE interface - who determines clock rate | CSU/DSU |
| What do LMI's do | Determine operational status of PVCs it knows, Transmit Keepalives every 10 secs, Tell the router what PVC's exist |
| In show frame-relay map for dynamic - what does the IP address refer to | Remote router - learned by inverse ARP |
| CIR stands for what | Commited Information Rate |
| RIP V1 and V2 Metrics | Distance Vector: Hop Count |
| BGP Metrics | Complicated path attribute metrics |
| OSPF Metrics | Bandwidth to compute path 'cost' |
| EIGRP Default Metrics | Bandwidth and Delay by default |
| Which router command is used on a stub network | ip classless |
| Which command displays all EIGRP feasible successor routes? | show ip eigrp topology |
| How to see EIGRP neighbors | show ip eigrp neighbors |
| Three characteristics of OSPF routing protocol usage | 1: Quick conversion, 2: Uses cost to determine best route, 3: OSPF routers discover neighbors before exhanging routes |
| EIGRP Routing metrics: [x/y] | x = Feasible Distance y = Advertised Distance |
| Which IPsec security protocol should be used when confidentiality is required | ESP [Encapsulation Security Protocol] - the security protocol used by ipsec. Based on encryption and algorithm and a key. |
| Reason for OSPF heirarchical areas: | 1: Confine instability to 1 area, 2: speed up convergence, 3: Reduce routing overhead. |
| Which two nat staements about static NATs are true: | They are aleays present in NAT table, 2 they allow connection to be initiated from the outside. |
| What is the adavantage of multipoint interface instead of p2p for framerelay? | IP addresses can be conserved if VLSM is not being used for subnetting. |
| IPV6 all-router multicast group | FF02::2 |
| IPV6 All-nodes multicast group | FF02::1 |
| IPV6 EIGRP routers group | FF02::A |
| IPV6 OSPF routers group | FF02::5 |
| IPV6 OSPF DR group | FF02::6 |
| IPV6 equivilent of loopback address | ::1 |
| How to get DLCI from priv mode? | show frame-relay map |
| How to get a static frame-relay map format correct? | frame-relay map ip x.x.x.x DLCI broadcast. You need the address and local DLCI |
| RSTP statements that are true | RSTP defines new port rules (Root, etc) and is compatible with original STP |
| What command shows memory usage by displaying flash and NVRAM utilization | show file systems |
| Purpose of inverse ARP | map known DLCI to an IP |
| What elects a root bridge on PVST+? | Lowest MAC address |
| Show frame-relay map displays what? | Value of local DLCI & status of PVC that is configured on the router. |
| what is the serial connection settings default which should be selected for non cisco routers | PPP |
| Name two true statements about dynamic access lists | They are used to authenticate individual users, and they are used for simpler management in large internetworks. |
| CHAP has what for one way authentication | a Three way handshake and occasional authentication periods. |
| Show only switchports command | sh interfaces switchport |
| Show only trunks command | sh interfaces trunk |
| show only vlan details | sh vlan id x |
| How long does PVST listen | 15 sec |
| How long does PVST learn | 15 sec |
| After PVST listen and learn what happens? | forwarding or blocking |
| EIGRP Multicast address | 224.0.0.10 |
| Steps to enable EIGRP | 1: router ip eigrp x 2: network addresses and wildcard 3: change interface hello and hold timers 4: Set bandwidth and delay values 5: Configure EIGRP authentication 6: Configure multiple equal-cost route |
| Where does an accesslist with 1-99 go closest to? | Destination (standard) |
| Where does and access-list with 101-199 go closest to? | Source (extended) |
| Named ACL Chacteristics: | You can delete individual statements in a named acl Named ACL must be specified and STD or EXTD You can use the ip access-list command to create named ACLs |
| What shows if an ACL is applied to an interface? | Show ip interface [interface] |
| What are the EIGRP metrics in the route brackets [xxxx/xxxx] | Feasible Distance / Advertised Distance |
| What is EIGRP Advertised distance? | Advertised Distance is the metric that is reported by neighbor routers. |
| What is EIGRP Feasible Distance? | Feasible Distance is the advertised distance + the calculated cost of the link to get there. |
| What is an EIGRP Feasible Successor | Feasible Successors are routes which are guaranteed to be route free. |
| OSPF HELLO PROTOCOLS | Maintains neighbor relationships Provides dynamic neighbor discovery |
| OSPF hello packet includes two important timers which are: | Hello interval and Dead interval. Dead = 4x hello so 4 can be sent between missed hello and link death. |
| What is required for all EIGRP routers to form relationships? | EIGRP required AS number on all EIGRP neighbors |
| OSPF discovery sequence number 1 | Neighbors discovered with hello packets and placed into 'Neighbor Table' |
| OSPF discovery sequence number 2 | Reliable TCP protocol used to send Link State Advertisements and topology information. |
| OSPF discovery sequence number 3 | Learned topology data placed into 'topology database' |
| OSPF discovery sequence number 4 | Each router runs the SPF algorithm (Djikstra) to calculate shortest path for it. |
| OSPF discovery sequence number 5 | Best routes placed into the IP routing table. |
| RIP 2 uses what port and multicast address? | RIP - UDP 524 / Multicast 224.0.0.9 |
| OSPF network statements use what? | Wildcard masks |
| What does EIGRP and OSPF need to enabled on them for routing to work on disparate networks | no auto-summary |
| Show frame-relay map gives you what? | p = command to verify DLCI destination address in a frame relay static configuration. |
| In eigrp-topology what is the successor and feasible successors | successor = Best route feasible successor = other good routes without loops |
| What is the NAT inside local address? | to IP address that is assigned to a host on the inside network. The address is probably not a public IP |
| What is the NAT inside global address? | a legitimate IP address that represents one or more inside local IP addresses to the world. |
| What is the NAT outside local address? | The IP address of an outside host as it appears to the inside network. Not necessarily a legitimate address, it was allocated from maddress space routable on the inside. |
| What is the NAT outside global address? | the IP address assigned to a host on the outside network by the hostsowner. Globally routable. |
| Dynamic NAT with overload is also called what? | PAT (Port Address Translation) |
| In a NAT table what does a * mean? | It was fast switched |
| How do you verify if NAT is providing translations? | show ip nat translations |
| How do you apply an access list to a debug? | debug ip packet <acl#> det |
| How do you debug NAT? | debug ip nat |
| What is the EIGRP successor route? | The proven route to the destination with the lowest administrative cost. |
Created by:
pkillur
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