CCIE R&S Advanced Technologies Class v4.5 - EIGRP Time Based Authentication

Transcript

1	Introduction	0h 43m
2	Using the Cisco Documentation	0h 52m
3	Ethernet Overview, Layer 2 Switchports, Trunking, ISL, 802.1q, DTP	0h 47m
4	VTP, VTP Authentication, VTP Pruning	1h 02m
5	VTP Prune Eligible List, VTP Transparent, VTP Troubleshooting, Trunk Allowed List, Extended VLANs	0h 48m
6	VLAN and VTP Review	0h 19m
7	SVIs, Native Routed Interfaces, Router-on-a-Stick	0h 46m
8	Layer 2 EtherChannel, EtherChannel Load Balancing, Layer 3 EtherChannel	0h 57m
9	802.1q Tunneling, Layer 2 Protocol Tunneling, EtherChannel over 802.1q Tunneling	1h 03m
10	STP Root Bridge Election, STP Root Port Election, STP Designated Port Election, STP Priority, STP Cost, STP Port-Priority	1h 46m
11	STP Review	0h 12m
12	STP Timers, STP PortFast	0h 34m
13	STP UplinkFast	0h 11m
14	STP BackboneFast	0h 12m
15	STP BPDU Filter	0h 13m
16	STP BPDU Guard	0h 11m
17	STP Root Guard	0h 11m
18	STP Loop Guard, Unidirectional Link Detection (UDLD)	0h 11m
19	Multiple Spanning-Tree Protocol (MST)	0h 40m
20	Rapid Spanning-Tree Protocol (RSTP), Rapid-PVST	0h 18m
21	MST with Multiple Regions	0h 33m
22	Flex Links	0h 16m
23	Frame Relay	0h 39m
24	Frame Relay Configuration Part 1	0h 34m
25	Frame Relay Configuration Part 2	0h 41m
26	Frame Relay Switching	0h 27m
27	Back-to-Back Frame Relay	0h 08m
28	Frame-Relay End-to-End Keepalives	0h 18m
29	PPP, PPP PAP Authentication, PPP CHAP Authentication	0h 59m
30	PPPoFR, PPPoE	0h 40m
31	Transparent Bridging, IRB	0h 32m
32	Fallback Bridging	0h 14m
33	IP Routing Overview, Switching Paths, Static Routing	0h 42m
34	Static Routing Examples	0h 25m
35	IP Default-Gateway, IP Default-Network	0h 14m
36	On-Demand Routing (ODR)	0h 07m
37	Floating Static Routes	0h 10m
38	Backup Interface	0h 29m
39	Enhanced Object Tracking, IP SLA, Reliable Static Routing	0h 21m
40	Policy Routing	0h 43m
41	GRE Tunneling, GRE Recursive Routing Errors	0h 27m
42	Reliable Backup Interface with GRE	0h 25m
43	RIP Overview, RIP Versions, RIP Auto-Summary	0h 48m
44	RIP Split-Horizon, RIP Timers	0h 22m
45	RIP Broadcast Updates, IP Directed Broadcast, IP Broadcast-Address, Smurf Attacks, Fraggle Attacks	0h 16m
46	RIP Unicast Updates	0h 03m
47	RIP Offset-List	0h 18m
48	RIP Authentication	0h 11m
49	RIP Summarization	0h 10m
50	Prefix-Lists, RIP Distribute-List Filtering, RIP Administrative Distance Filtering	0h 48m
51	RIP Default Routing, RIP Conditional Default Routing	0h 18m
52	RIP Triggered, RIP Validate Update Source,	0h 12m
53	EIGRP Overview	0h 29m
54	EIGRP Auto-Summary	0h 07m
55	EIGRP Split-Horizon	0h 11m
56	EIGRP Update Types, EIGRP Neighbor, EIGRP Passive-Interface	0h 24m
57	EIGRP Hello-Interval, EIGRP Hold-Time	0h 05m
58	EIGRP Authentication	0h 11m
59	EIGRP Time Based Authentication	0h 25m
60	EIGRP Path Selection, EIGRP Metric Weights, EIGRP Traffic Engineering	0h 47m
61	EIGRP Unequal Cost Load Balancing, EIGRP Variance	0h 19m
62	EIGRP QUERY, EIGRP Summarization, EIGRP Leak-Map	0h 28m
63	EIGRP Stub Router Advertisement	0h 22m
64	EIGRP Default Routing	0h 13m
65	EIGRP Route Filtering	0h 11m
66	EIGRP Router-ID	0h 07m
67	Miscellaneous EIGRP Features	0h 02m
68	OSPF Overview	0h 27m
69	Establishing OSPF Adjacencies, Understanding the OSPF Database	0h 43m
70	OSPF Network Type Broadcast, OSPF DR/BDR Election, OSPF over NBMA, OSPF Network Type Non-Broadcast and Point-to-Multipoint	0h 56m
71	OSPF Network Type Point-to-Point, OSPF Network Type Mismatch	0h 13m
72	OSPF Network Type Point-to-Multipoint Non-Broadcast, OSPF Per Neighbor Cost	0h 17m
73	OSPF Network Type Loopback	0h 02m
74	OSPF Path Selection	0h 27m
75	OSPF Convergence Timers	0h 09m
76	OSPF Authentication	0h 12m
77	OSPF Summarization	0h 32m
78	OSPF Stub Areas, OSPF Totally Stubby Areas, OSPF NSSAs, OSPF Totally NSSAs	0h 40m
79	Controlling OSPF NSSA Redistribution	0h 02m
80	OSPF Type 7 to 5 Translator Election, OSPF LSA Type 3 Filter, OSPF Forwarding Address Suppression	0h 24m
81	Route Redistribution Overview	0h 36m
82	Route Redistribution Configuration & Verification, Connected Redistribution	0h 22m
83	OSPF External Path Selection, TCL PING Scripting	0h 33m
84	Routing Loops Overview, EIGRP Route Loop Prevention	0h 55m
85	Metric Based Routing Loops, Route Tagging	0h 46m
86	Administrative Distance Based Routing Loops, Debug IP Routing, IP Route Profile	0h 58m
87	BGP Overview, BGP Peering Types	0h 51m
88	Establishing BGP Peerings, EBGP Multihop, BGP Neighbor Disable Connected Check, BGP TTL Security	0h 49m
89	BGP 4-Byte ASNs	0h 20m
90	BGP Local AS, BGP Peer Groups	0h 30m
91	BGP Next-Hop Self, BGP Next-Hop Processing	0h 30m
92	BGP Route Reflectors	0h 37m
93	Large Scale BGP Route Reflectors with Clusters	0h 34m
94	BGP Confederation	0h 37m
95	BGP NLRI Advertisements, BGP Network Statement, BGP Redistribution	0h 43m
96	BGP Aggregation, BGP Aggregation & Summary-Only, BGP Aggregation & Unsuppress-Map	0h 46m
97	BGP Origin, BGP Aggregation & AS-Set, BGP Aggregation & Advertise-Map	0h 22m
98	BGP Conditional Route Injection	0h 21m
99	BGP Bestpath Selection, BGP Multipath, BGP Weight	0h 53m
100	BGP Local Preference, BGP Local Preference and Communities, BGP AS-Path Prepending,	0h 30m
101	BGP MED, BGP MED Missing As Worst, BGP Deterministic MED	0h 17m
102	BGP Communites, BGP Regular Expressions	0h 43m
103	BGP Filtering, BGP Convergence Timers, BGP Default Routing, Miscellaneous BGP Features	0h 24m
104	MPLS Overview, MPLS Label Distribution Protocol (LDP)	1h 05m
105	MPLS Tunnels, MPLS Penultimate Hop Popping (PHP)	0h 40m
106	MPLS Layer 3 VPNs Overview, VRF Lite	0h 36m
107	MPLS Layer 3 VPNs and VPNv4 BGP	1h 08m
108	MPLS Layer 3 VPN Verification & Troubleshooting	0h 49m
109	MPLS Layer 3 VPN OSPF PE-CE Routing Overview	0h 06m
110	MPLS Layer 3 VPN OSPF PE-CE Routing Path Selection & Sham-Links	2h 01m
111	MPLS Layer 3 VPN OSPF PE-CE Routing Loop Prevention & Down-Bit, OSPF Capability VRF-Lite	0h 40m
112	IPv6 Overview, IPv6 ICMPv6 ND, IPv6 over NBMA	0h 44m
113	IPv6 Routing Overview, IPv6 Static Routing	0h 28m
114	IPv6 RIPng	0h 20m
115	IPv6 EIGRPv6	0h 09m
116	IPv6 OSPFv3	0h 31m
117	MP-BGP for IPv6	0h 26m
118	IPv6 Tunneling	1h 13m
119	Multicast Overview, IGMP	0h 34m
120	PIM Overview	0h 18m
121	PIM Dense Mode	1h 03m
122	PIM Sparse Mode	0h 30m
123	PIM Sparse Mode Configuration	0h 36m
124	PIM Sparse Mode RPF & RP Troubleshooting	0h 27m
125	Auto-RP, Multicast over GRE Tunnels	0h 53m
126	Bootstrap Router (BSR), Bidirectional PIM, Source Specific Multicast (SSM)	0h 40m
127	MSDP, Anycast RP	0h 27m
128	IPv6 Multicast Routing	0h 24m
129	QoS Overview, IntServ QoS, DiffServ QoS, IP Precedence, DSCP, MQC, HQF	0h 41m
130	MQC Classification	0h 44m
131	FIFO, FQ, WFQ, CBWFQ, HQF	0h 50m
132	LLQ	0h 23m
133	WRED	0h 31m
134	Traffic Shaping, Traffic Policing	0h 40m
135	Frame Relay Traffic Shaping (FRTS)	0h 33m
136	RSVP	0h 07m
137	Catalyst 3560 QoS	1h 00m
138	IOS Security Overview, Access Lists (ACLs)	0h 58m
139	Time Based ACLs, Dynamic ACLs	0h 33m
140	Reflexive ACLs	0h 21m
141	TCP Intercept, Content Based Access Control (CBAC)	0h 34m
142	Zone Based Policy Firewall (ZBPF)	1h 09m
143	AAA, Local Authentication, Local Authorization, Role Based CLI Access	0h 43m
144	Port Security, Static CAM Entries, Storm Control, 802.1X Authentication, PACLs, RACLs, VLAN Access Maps (VACLs)	0h 48m
145	DHCP Snooping, Dynamic ARP Inspection (DAI), IP Source Guard	0h 12m
146	Protected Ports, Private VLANs	0h 25m
147	IP Services Overview, HSRP	1h 10m
148	VRRP, GLBP	0h 28m
149	NAT	0h 42m
150	DHCP, DNS	0h 30m
151	NetFlow	0h 09m
152	WCCP, Miscellaneous IP Services	0h 06m
153	System Management Overview, NTP, NTP Authentication	0h 24m
154	SNMP, RMON	0h 38m
155	Syslog, Telnet, SSH, Banners	0h 21m
156	EEM Scripting, Miscellaneous System Management	0h 26m
Total Duration		81h 42m

Slides - Diagrams

Slides - Introduction

Slides - Ethernet Switching

Slides - Advanced Ethernet Switching

Slides - Frame Relay

Slides - PPP

Slides - Transport Bridging

Slides - Redistribution

Slides - IOS Security

Slides - Layer 2 Security

Slides - IP Services

Slides - System Management

0:00:13	So next, let's look at the
0:00:18	Again, the mian point of this...
0:00:21	is that we need to make sure that the routers
0:00:26	Otherwise, the key numbers will become
0:00:31	and then, the devices will not
0:00:34	So really, the first step before
0:00:38	would be to make sure that all of the
0:00:44	Now, there's two things that I
0:00:47	First, I'm going to define
0:00:51	So, everyone's clock is fairly
0:00:55	Then, I'm gonna configure NTP to make sure
0:01:01	The reason that I'm going to
0:01:05	is that if any of the two
0:01:09	have clock values that are too far apart,
0:01:13	so if we were to look at let's say...
0:01:17	router 1,
0:01:19	and we'll look at the Show Clock.
0:01:23	Router 1 says that the time is...
0:01:27	on Friday, March 1, 2002.
0:01:31	Where if we look on
0:01:35	Router 4 says that it's March 5th 2000.
0:01:40	So, depending on whether the devices
0:01:44	Okay, on switch 1, it says 1993.
0:01:47	So, they're kind of all over the
0:01:51	But the problem is now that if switch 1
0:01:53	tries to become an NTP client of
0:01:59	and says that it's April in 2011,
0:02:02	then, either they will no
0:02:07	or it's gonna take a very, very
0:02:11	Because when you look at the
0:02:15	it basically says you have two options.
0:02:17	Either your clock is within a
0:02:23	in which case, we can do
0:02:26	But if your clock is way far
0:02:29	then, we have to do a
0:02:33	So, typically, you'll see that the clock will adjust itself
0:02:39	but if I'm 10 years off, it may
0:02:44	So, what we can do instead is just make sure
0:02:49	then, configure NTP,
0:02:51	and we should see that everyone is
0:02:58	So then, first, let's set
0:03:01	Clock Set.
0:03:04	And we'll say just any
0:03:07	"Midnight on January 1st 2000".
0:03:16	So, I'm gonna take this value
0:03:20	So, from the access server,
0:03:22	I'll put everyone into exact mode
0:03:31	Now, we know that this is not gonna be
0:03:36	when I'm sending this command and
0:03:40	So, if we look at the Show
0:03:46	we may see that there are
0:03:49	but it's gonna be fairly close.
0:03:51	At least it's gonna be close enough
0:03:56	there's not gonna be any
0:03:58	So now, let's say that...
0:04:00	somewhere central in the
0:04:04	we'll have router 3 be the NTP server.
0:04:08	Then, all of the other routers in the network,
0:04:13	So, this then assumes that we have IP reachability
0:04:20	So, you could end up in kind
0:04:25	to get the correct time,
0:04:28	but to the route, you need the correct time
0:04:34	So, you do need to make sure that
0:04:38	Otherwise, they could fail the authentication
0:04:41	Now, there's a question here, "In the lab exam,
0:04:47	I would probably go ahead and do it.
0:04:49	I woud set it to whatever the local time is.
0:04:52	So then, if you're trying to sort through
0:04:56	you actually know when it happened.
0:04:59	So, just look at the clock that's on the desktop
0:05:04	and then set the clock close to that.
0:05:07	So, if there's no question in the exam
0:05:13	then, it's not gonna matter if you
0:05:16	So, you're not gonna loose
0:05:18	The only issue would be if there's an
0:05:22	and you don't configure it the same way,
0:05:25	then, obviously, you're not gonna
0:05:29	So, if they say, configure
0:05:33	and I configured this router 3, then,
0:05:38	But in our case here, we're just
0:05:40	doing the authentication
0:05:47	So now, let's go to router 3,
0:05:51	And we'll say, NTP Master 1.
0:05:54	Where 1 is its stratum number.
0:05:58	Now, on all the other routers, we should
0:06:03	Let's say to router 3's loopback,
0:06:06	which we do.
0:06:08	So, on all of the routers, I'm just gonna
0:06:14	We'll say, NTP Server...
0:06:16	150.10.3.3.
0:06:20	So, no special options. We're not doing
0:06:27	We're just specifying on everyone
0:06:31	Now, if this is working, we should be
0:06:37	and see that the clock is synchronized.
0:06:41	In this case, the clock is unsynchronized,
0:06:46	which means that we're still waiting...
0:06:48	to get the correct time from the server.
0:06:51	It says that our stratum is 16,
0:06:56	What I wanna see is what is the reference
0:07:00	The reference time is gonna be...
0:07:03	what the server is advertising to us.
0:07:05	So, if we now look at the
0:07:07	we should see ideally that this is
0:07:14	So, let's see, does router 5
0:07:18	Okay, it does.
0:07:19	So, if we keep looking at this, let's say,
0:07:23	sync.
0:07:28	We should see this
0:07:30	Okay, so let's look on everyone else.
0:07:34	Lets say on router, okay, 1 is synchronized.
0:07:40	2 is synchronized.
0:07:42	3 is gonna be synchronized, because its
0:07:49	4 is not synchronized.
0:07:53	5 is not.
0:07:56	6 is not.
0:07:59	Switch 1 is.
0:08:03	Switch 2, 3, and 4 are.
0:08:06	Okay so, the problems are
0:08:10	Now, I could just wait...
0:08:12	and see if the clocks are
0:08:17	But what I could do
0:08:19	would be to remove the NTP
0:08:26	150.10.3.3.
0:08:29	Then, put the command back.
0:08:32	This is essentially just gonna
0:08:36	So now, let's see... Do Show
0:08:49	And we should be getting the
0:08:52	Let's now look at the...
0:08:55	Let's check on router 5 one more time.
0:08:58	Let's look at the Debug NTP Packets.
0:09:02	And see at least, are we receiving...
0:09:08	the NTP updates from...
0:09:11	router 3?
0:09:15	Okay, there's a question here,
0:09:21	serial?" I believe that it's on on all the
0:09:29	So, we do have all the
0:09:34	Log...
0:09:36	I am logging, debugging to the console.
0:09:41	But I'm not receiving any
0:09:58	Okay, message sent from...
0:10:04	Message sent to router 3
0:10:07	Message received from them.
0:10:11	Let's say, Debug NTP...
0:10:15	Packet Detail.
0:10:19	We should see the specific clock
0:10:25	So, let's do this. Let's remove the server
0:10:36	And then, we'll put it back. So...
0:10:37	This is one one of the configurations
0:10:41	because the configuration is very straightforward.
0:10:46	But...
0:10:47	for whatever reason, sometimes,
0:10:51	Where we saw in some other platforms, it did.
0:10:55	Where either it's a platform issue
0:10:59	routers 4, 5, and 6, because they're
0:11:10	So, we received the message from 3.
0:11:14	This is the received time.
0:11:18	That's when 3 transmitted the time.
0:11:22	So, why are we not installing this then?
0:11:32	No, it's not allowing it.
0:11:57	So, 3 is the NTP master.
0:12:03	on 3, and let's set the
0:12:13	Then, on all the other routers,
0:12:17	So, we'll say, "No NTP Server is router 3.
0:12:24	NTP Server is 5."
0:12:41	So on router 5 now, let's look
0:12:48	It says we're still unsynchronized.
0:13:00	Which doesn't make any sense
0:13:04	Show NTP Status.
0:13:08	Okay, it says now we're synchronized.
0:13:10	Or stratum 1.
0:13:12	Let's see what routers 4 and 6 say.
0:13:19	They're still unsynchronized. I'm wondering
0:13:24	router 5 as a stratum 1 server,
0:13:26	because typically, stratum 1 is
0:13:30	either an atomic clock, or a GPS clock
0:13:34	that is highly, highly accurate. So, let's
0:13:40	that it's not stratum 1.
0:13:47	So No NTP Master.
0:13:50	NTP Master 5.
0:13:56	Then, on router 4, let's say, Show NTP Status.
0:14:00	Okay, let's try removing this.
0:14:04	No NTP Server.
0:14:09	And I'll go all the way back to exact
0:14:12	Then, NTP Server is router 5.
0:14:21	And Show NTP Status.
0:14:28	Still unsynchronized.
0:14:29	So, I think eventually,
0:14:33	this will work.
0:14:35	But sometimes, it just takes a
0:14:40	We can see on the other devices, if we
0:14:46	So, 1 is unsynchronized as well.
0:14:56	But somebody here should be.
0:14:58	Okay, 5 is because it's...
0:15:02	So let's see, Show Run in NTP.
0:16:14	I'm wondering if 5 knows
0:16:18	because it has a hardware clock.
0:16:21	So, it may be that I need to reboot...
0:16:25	in order to get the time working.
0:16:27	So, for now, we'll leave the NTP.
0:16:30	We're gonna come back when we get to
0:16:34	How to do the authentication, how to do
0:16:38	But really, as long as the clocks are...
0:16:45	as long as the clocks are fairly
0:16:48	So, let's look at Show
0:16:52	versus the Show Clock on switch 2.
0:16:58	They're only within a couple seconds
0:17:02	Okay, the key for this though is that
0:17:07	if we look at Show Run Section Key Chain.
0:17:12	And the Show Key Chain.
0:17:15	By default,
0:17:17	any of the keys have an infinite
0:17:22	Which means that we will
0:17:25	and we will accept the key number in
0:17:29	as long as the key number matches,
0:17:32	then, the authentication is good.
0:17:34	But the acceptance and lifetime, this is where
0:17:39	So, lets say now on router 5
0:17:44	for Key 10,
0:17:46	the send lifetime is from
0:17:55	through...
0:17:59	let's say, 23:59:59 on December 31st, 2000.
0:18:12	And the accept lifetime is gonna be the same.
0:18:19	Then, we'll say, for Key 20,
0:18:22	which will have a new key string...
0:18:25	we'll say, key string is 20.
0:18:28	We'll have a different send and accept
0:18:35	Both...
0:18:44	Both sending it and accepting it.
0:18:47	So now lets look at the Show Key Chain,
0:18:50	it says that the first key...
0:18:53	is valid now, because that's
0:18:56	The next key is not, because
0:19:00	It's not anywhere between January 1st
0:19:07	Now, where you can also run into
0:19:11	is that when the routers actually
0:19:14	it's gonna take some sort of finite time and actually
0:19:22	Whereas in this case, I'm not giving
0:19:27	for overlap between the keys.
0:19:31	So, there could be a potential
0:19:36	on January 1st 2001 that the
0:19:42	because one of them is sending key number 10,
0:19:48	Then, eventually, they would regain
0:19:54	but at that exact point, we
0:19:57	which means we're gonna
0:20:01	So, what we should do here ideally
0:20:04	is extend what the accept lifetime or
0:20:11	to overlap with the second one.
0:20:15	So, let's say that for key number 10,
0:20:18	we're going to continue
0:20:24	December 31st 2000.
0:20:28	Which means that if the other
0:20:34	it means that we are going
0:20:38	Okay, then likewise, with the
0:20:41	we probably wanna set this
0:20:45	January 1st 2001...
0:20:47	to make sure that they're not gonna
0:20:51	So, let's say Show Run...
0:20:54	Section Key Chain.
0:21:02	And let's make this change as No Path.
0:21:04	So, let's say here that "For the first key,
0:21:09	I'm gonna continue to accept it for...
0:21:14	let's say, 5 minutes after January 1st 2001."
0:21:21	So, this is giving me 5 minutes of
0:21:26	Then, the new key, I will accept this
0:21:30	for 5 minutes prior. So, 23:55:00
0:21:37	on December 31st 2000.
0:21:43	So now, we have a decent amount of
0:21:47	that if for some reason the clocks
0:21:51	then, the router should
0:21:56	So, let's apply this both on...
0:21:58	router 5 and...
0:22:03	switch 2.
0:22:04	So now, router 5, if we Show Key Chain,
0:22:08	we should see the new...
0:22:13	the new values here.
0:22:15	Okay, we can see the
0:22:18	We're accepting this for an
0:22:23	the old one is stopped being sent.
0:22:26	Then, the new one, we're accepting it 5
0:22:32	Again, just a protection mechanism to make
0:22:38	Then, on switch 2, we'll do the same thing.
0:22:46	So now, if we Show...
0:22:48	Key Chain.
0:22:51	And Show Clock.
0:22:54	Since it's currently January 1st 2000,
0:23:00	Now, if we were to change this,
0:23:11	January 1st 2001.
0:23:16	When I change this on switch 2,
0:23:20	and then, there's a delay before
0:23:26	we can see that there was a
0:23:32	So, since they were'nt agreeing on
0:23:36	then, the authentication fails. So, even
0:23:41	but if your network is very high availability...
0:23:45	in the design, then,
0:23:49	So now, if we look at
0:23:53	the new one is valid,
0:23:56	but the old one is invalid.
0:24:00	So, that's why we lost the
0:24:02	So really, for this configuration,
0:24:07	and the send lifetime should be extended.
0:24:10	So that it's gonna add to that overlap.
0:24:13	So, I would wanna say basically
0:24:19	the send lifetime.
0:24:23	And then, the same thing down
0:24:31	So, as long as they're both sending
0:24:36	then, we shouldn't have that failure,
0:24:39	So now, let's try this one of both of them.
0:24:51	Then, we'll set the clock back to 2000.
0:25:03	Same thing on router 5. If we
0:25:08	we can see now, the first key is valid.
0:25:11	If we Show IP EIGRP Neighbors,
0:25:16	we see that we are adjacent with switch 2.
0:25:19	Okay, now again, if we change
0:25:26	and look at the Show Key
0:25:31	5 says that both of them are valid.
0:25:35	Then, when switch 2 eventually
0:25:40	and we Show Key Chain.
0:25:44	Now, switch 2 likewise agrees
0:25:49	But during that period, when they
0:25:53	we see that the adjacency

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CCIE R&S Advanced Technologies Class v4.5
Title:	CCIE R&S Advanced Technologies Class v4.5
Duration:	81h 42m
The CCIE Routing & Switching Advanced Technologies Class is the first step in understanding CCIE level technologies and is a companion to the Advanced Technologies Lab Workbook. Each technology you need to know for the CCIE Routing & Switching lab will be described in detail using an instructor led hands on demonstration. The class consists of over 80 hours of in depth explanations and examples.
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EIGRP Time Based Authentication

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